1.- Improved the captureScreen and captureScreenAsync functions by making the call to the native extension.
2.- Added the saveToGallery parameter.
3.- Added the setWebGLEnabled function.
Fixed the extension.callNative functions to be Cocoon.callNative instead.
Merge branch 'develop'

Conflicts:
	src/device/cocoon_utils.js
Merge branch 'master' of https://github.com/ludei/cocoonjs-plugins