Add podspec for CocoaPods support

Save the picture to the album to broadcast the album refresh

Fix iOS Hang by Using Proper Method Queue

fix(RNViewShotModule): FileNotFound exception

My previous commit didn't fixed issue with nested paths, so this commit fixes it.

recursively create folders before creating file

Add "repository" key to package.json

Adding `repository` allows the npm registry to link back to the repo.

React Native Windows Support

fixes https://github.com/gre/react-native-view-shot/issues/21

drop filename option, add path option

Fix ScrollView Snapshots