New Android property "overlay"

Exposing GLCanvas.setZOrderMediaOverlay as React Native prop. Setting
it to true put the new SurfaceView above the previous. Fixes issue #131

there were a breaking in RN if you use AnimatedSurface

Fixing snapshot size in android

* upstream/master:
  2.35.0-rc.0
  prepare for .35-rc.0
  Add new param for partialLoadBlock in imageloader

Add new param for partialLoadBlock in imageloader

Since React Native 0.35.0-rc.0 this parameter to imageloader is required.

Support RN 0.34

This change adds support for RN 0.34.0-rc0.

Related changes in RN:
https://github.com/facebook/react-native/commit/1a7c231ef35812e8d4a79cd2482c69b10c52dc4a
https://github.com/facebook/react-native/commit/a718f14af7fee54457f7f89d2a89efb2f61a28ef#diff-eb2d634923bec6e03e2ba8558ff3c3b8

This now works for animated surfaces

Updating the animated surface for RN 0.33

This commit https://github.com/facebook/react-native/commit/eb3360b02ab82d20bc3c3f38f543b0d742598346 requires this change.