2.0.0

https://github.com/facebook/react-native/releases/tag/v0.16.0-rc
> RCTSparseArray was replaced by NSDictionary. Modules using RCTSparseArray should update.

Android implementation

probable race condition fixed, syncData is not executed during the draw phase

probable race condition fixed, syncData is not executed during the draw phase

This fix livereload issues with a more robust and react-native' compliant approach
for holding contextual gl context and shaders via the bridge.

use device screen scale for canvas scale factor