Fixes issue with finding React Native version

* Fixes 284

Searching for reactNative version in projects ext root now uses safeExtGet to stop build issues where reactNative is not set.

closes #275

type: fix for typescript (add missing type)

Add `number` to first argument of `captureRef()` as original flowtyped typing

Fix react native version in android build.gradel file

closes #190

fix the bug that deposit the wrong bitmap to buffer

Fix crash on android api level less than 21

Fix next props call

fixed Testable RN 0.60.3

Fixes compile error when getting packaged by metro

[js] Add React.Ref support to captureRef

Fix dependency incompatibility

Fix index.d.ts import from react-native types

Old config called `Android dependency 'com.android.support:support-v4' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution` error, this PR has fixed this

Fix flow types