fixes #371

The link was missing in the README for the getting started page, the square brackets were there though so looks like whoever wrote it just forgot to put the link there.

* Add reference examples for:
- onError
- onNavigationStateChange
- originWhiteList
- renderError
- renderLoading
- onShouldStartLoadWithRequest

* Update to use jsx as code
Add properties of objects passed into methods

* Add examples for:
- onLoad
- onLoadEnd
- onLoadStart
- onLoadProgress
- style

* Add object descriptions, fix style issues, and remove onShouldStartLoad example

Object Descriptions for:
- onLoad
- onLoadEnd
- onLoadStart
- onLoadProgress

* Update Reference.md

Per #320, this adds an example for onShouldStartLoadWithRequest.

* Adds guide for handling navigation state changes

* Update Guide.md

* chore(docs): Updated readme.md

* Update README.md

* Update README.md

## [5.2.3](https://github.com/react-native-community/react-native-webview/compare/v5.2.2...v5.2.3) (2019-02-28)

### Bug Fixes

* **Android <input />:** Support file extensions in file input accept attributes ([#357](https://github.com/react-native-community/react-native-webview/issues/357)) ([803a3b0](https://github.com/react-native-community/react-native-webview/commit/803a3b0))

The current implementation doesn't support a list of file extensions in the accept attribute (e.g. `<input type="file" accept=".jpg, .png">`) while that is a valid value per the HTML spec. I've updated the implementation to convert any file extensions to mime types before we set the type(s) on the intent to rectify the issue. In addition I've updated the `acceptsImages` and `acceptsVideo` methods to handle file extensions as well.

I was able to fix a bug with videos loaded from Azure that wouldn't start unless I set that prop to `false`

## [5.2.2](https://github.com/react-native-community/react-native-webview/compare/v5.2.1...v5.2.2) (2019-02-28)

### Bug Fixes

* **android:scalesPageToFit:** scalesPageToFit does not work as intended , especially for large jpg and png images. ([#275](https://github.com/react-native-community/react-native-webview/issues/275)) ([a661df1](https://github.com/react-native-community/react-native-webview/commit/a661df1)), closes [#113](https://github.com/react-native-community/react-native-webview/issues/113)
* **WKWebview Scroll:** Don't allow the scrollView to scroll when `scrollEnabled={false}`. ([#158](https://github.com/react-native-community/react-native-webview/issues/158)) ([0e6e92a](https://github.com/react-native-community/react-native-webview/commit/0e6e92a))

fixes #113

- One can verify that this for jpg images loaded on the webview (eg: https://www.ecda.gov.sg/growatbeanstalk/PublishingImages/READ%20Publications%20and%20Research/Parent%20Infographic%20Series/Infographic%204.jpg)
- This is a replication of the pull request that was originally made in the react-native repo (https://github.com/facebook/react-native/pull/17195), but was not merged in due to no reviews.

* Don't allow the scrollview to scroll the WebView body.

* Readme comment

* Remove duplicate protocol def

Adds @jeluard as a contributor for doc.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/347#issuecomment-463999246)

Doc is now up-to-date with latest `react-native-webview` changes

## [5.2.1](https://github.com/react-native-community/react-native-webview/compare/v5.2.0...v5.2.1) (2019-02-14)

### Bug Fixes

* **WKWebView:** resolved crash with WebKit on iOS 9.x. ([#342](https://github.com/react-native-community/react-native-webview/issues/342)) ([f27f13e](https://github.com/react-native-community/react-native-webview/commit/f27f13e)), closes [#150](https://github.com/react-native-community/react-native-webview/issues/150) [#213](https://github.com/react-native-community/react-native-webview/issues/213) [jerolimov/react-native-webview#fix-ios9](https://github.com/jerolimov/react-native-webview/issues/fix-ios9) [jerolimov/react-native-webview#fix-ios9](https://github.com/jerolimov/react-native-webview/issues/fix-ios9)

This PR fixes two crashes when enableWebKit is true (which was the default) on iOS 9.x. The first one when the WebView component was mounted (fixes issue #150) and the second one, when the component was unmounted (fixes issue #213).

The first problem happen when the RNCWKWebView.m was loaded:

The programming guide for WebKit (version 2006) ([pdf](http://mirror.informatimago.com/next/developer.apple.com/documentation/Cocoa/Conceptual/DisplayWebContent/WebKit_DisplayWebContent.pdf)) from Apple said, that it is (was) required to check if the 'new' WebKit Framework was available. This was required when the WebKit framework was only available on Mac OS X (10.2) when the Safari was installed. 😆

Because WebKit is (currently..) a fix part of iOS we didn't need this check this anymore to determinate if WebKit is available. I also see no other reference that this is required in iOS so I just remove this code. Without this code the WebView works also on iOS 9.x.

The second issue happen when the WKWebView was removed from the native view hierarchy. Its required (only on iOS 9) to remove the UIScrollView delegate before cleaning up the webview.

Its possible to try this PR with:

```
npm install --save "react-native-webview@jerolimov/react-native-webview#fix-ios9-crash"
# or
yarn add "react-native-webview@jerolimov/react-native-webview#fix-ios9-crash"
```

If you use CocoaPods, you should also update your Pods with

```
cd ios && pod update && cd ..
```

# [5.2.0](https://github.com/react-native-community/react-native-webview/compare/v5.1.0...v5.2.0) (2019-02-12)

### Features

* **toggle scroll bar:** added new props showsVerticalScrollIndicator / showsHorizontalScrollIndicator ([#250](https://github.com/react-native-community/react-native-webview/issues/250)) ([92c2058](https://github.com/react-native-community/react-native-webview/commit/92c2058))

* docs: update README.md

* docs: update .all-contributorsrc

# [5.1.0](https://github.com/react-native-community/react-native-webview/compare/v5.0.8...v5.1.0) (2019-02-12)

### Features

* **wkwebview:** create api to allow clients to present a client credential for authentication ([#141](https://github.com/react-native-community/react-native-webview/issues/141)) ([fc5fd24](https://github.com/react-native-community/react-native-webview/commit/fc5fd24))

* In order for TLS Mutual Auth to work for webviews, the caller must present a credential. Expose a setter that can be called to set a credential.

## [5.0.8](https://github.com/react-native-community/react-native-webview/compare/v5.0.7...v5.0.8) (2019-02-11)

### Bug Fixes

* **types:** Add new cacheEnabled prop to typescript prop type declarations ([#335](https://github.com/react-native-community/react-native-webview/issues/335)) ([ff62c95](https://github.com/react-native-community/react-native-webview/commit/ff62c95))

* Deleted onShouldStartLoadWithRequest platform reference

according to b1b662628e it's supported on android and Ios so  no platfor reference is needed

* Deleted onShouldStartLoadWithRequest platform reference 

Now with added note

* docs: update README.md

* docs: update .all-contributorsrc

## [5.0.7](https://github.com/react-native-community/react-native-webview/compare/v5.0.6...v5.0.7) (2019-02-08)

### Bug Fixes

* **package.json:** Warning because peerDependencies >=0.57 <0.59 ([#279](https://github.com/react-native-community/react-native-webview/issues/279)) ([#327](https://github.com/react-native-community/react-native-webview/issues/327)) ([46286b2](https://github.com/react-native-community/react-native-webview/commit/46286b2))

## [5.0.6](https://github.com/react-native-community/react-native-webview/compare/v5.0.5...v5.0.6) (2019-02-06)

### Bug Fixes

* **WKWebView.m:** Reapplied [#134](https://github.com/react-native-community/react-native-webview/issues/134) with additional checks to tackle unintentional scrolls ([#296](https://github.com/react-native-community/react-native-webview/issues/296)) ([3f58b0e](https://github.com/react-native-community/react-native-webview/commit/3f58b0e))

## [5.0.5](https://github.com/react-native-community/react-native-webview/compare/v5.0.4...v5.0.5) (2019-02-05)

### Bug Fixes

* **iOS/android getViewManagerConfig:** Fix crash with react-native < 0.58 ([263fc5e](https://github.com/react-native-community/react-native-webview/commit/263fc5e))

## [5.0.4](https://github.com/react-native-community/react-native-webview/compare/v5.0.3...v5.0.4) (2019-02-04)

### Bug Fixes

* **UIWebview:** Deprecate UIWebView and add link to issue ([#313](https://github.com/react-native-community/react-native-webview/issues/313)) ([4c80240](https://github.com/react-native-community/react-native-webview/commit/4c80240))

* Update WebView.ios.js

* Update WebView.ios.js

## [5.0.3](https://github.com/react-native-community/react-native-webview/compare/v5.0.2...v5.0.3) (2019-02-04)

### Bug Fixes

* **android/iOS:** Fixed react-native 0.58 warnings ([#311](https://github.com/react-native-community/react-native-webview/issues/311)) ([4a4ccd8](https://github.com/react-native-community/react-native-webview/commit/4a4ccd8))

Adds @MalcolmScruggs as a contributor for code, tool, test.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/293#issuecomment-460077647)

## [5.0.2](https://github.com/react-native-community/react-native-webview/compare/v5.0.1...v5.0.2) (2019-02-03)

### Bug Fixes

* **webviewShared.js:** Support all valid URI schemes and add testing ([#293](https://github.com/react-native-community/react-native-webview/issues/293)) ([fb78d13](https://github.com/react-native-community/react-native-webview/commit/fb78d13)), closes [/tools.ietf.org/html/rfc3986#section-3](https://github.com//tools.ietf.org/html/rfc3986/issues/section-3)

* Change origin whitelist to allow for all valid URIs

- Now supports +, -, and .
- Prevent whitelist from matching when preceded by unwanted characters
- URI must begin with letter
- URI Scheme syntax: https://tools.ietf.org/html/rfc3986#section-3.1

* Add jest testing framework and run it on CI

* Add tests for WebViewShared's createOnShouldStartLoadWithRequest

* docs: update README.md

* docs: update .all-contributorsrc

## [5.0.1](https://github.com/react-native-community/react-native-webview/compare/v5.0.0...v5.0.1) (2019-02-01)

### Bug Fixes

* **PostMessage:** Renamed ReactNativeWebview to ReactNativeWebView ([d5fc028](https://github.com/react-native-community/react-native-webview/commit/d5fc028)), closes [#304](https://github.com/react-native-community/react-native-webview/issues/304)

fixes #304

# [5.0.0](https://github.com/react-native-community/react-native-webview/compare/v4.1.0...v5.0.0) (2019-02-01)

### Features

* **Android/iOS postMessage:** refactoring the old postMessage implementation ([#303](https://github.com/react-native-community/react-native-webview/issues/303)) ([f3bdab5](https://github.com/react-native-community/react-native-webview/commit/f3bdab5)), closes [#29](https://github.com/react-native-community/react-native-webview/issues/29) [#272](https://github.com/react-native-community/react-native-webview/issues/272) [#221](https://github.com/react-native-community/react-native-webview/issues/221) [#105](https://github.com/react-native-community/react-native-webview/issues/105) [#66](https://github.com/react-native-community/react-native-webview/issues/66)

### BREAKING CHANGES

* **Android/iOS postMessage:** Communication from webview to react-native has been completely rewritten. React-native-webview will not use or override window.postMessage anymore. Reasons behind these changes can be found throughout so many issues that it made sense to go that way.

Instead of using window.postMessage(data, *), please now use window.ReactNativeWebView.postMessage(data).

Side note: if you wish to keep compatibility with the old version when you upgrade, you can use the injectedJavascript prop to do that:

const injectedJavascript = `(function() {
  window.postMessage = function(data) {
    window.ReactNativeWebView.postMessage(data);
  };
})()`;

Huge thanks to @jordansexton and @KoenLav!

fixes #29
fixes #272
fixes #221
fixes #105
fixes #66

BREAKING CHANGE: Communication from webview to react-native has been completely rewritten. React-native-webview will not use or override window.postMessage anymore. Reasons behind these changes can be found throughout so many issues that it made sense to go that way.

Instead of using window.postMessage(data, *), please now use window.ReactNativeWebView.postMessage(data).

Side note: if you wish to keep compatibility with the old version when you upgrade, you can use the injectedJavascript prop to do that:

const injectedJavascript = `(function() {
  window.postMessage = function(data) {
    window.ReactNativeWebView.postMessage(data);
  };
})()`;

Huge thanks to @jordansexton and @KoenLav!