* Refactored Compatibility code
* Added CompatibilityInfo class
* Removed getApplicationScale from Context
* Added Resources#getCompatibilityInfo so that RootView can get the compatibility info w/o going through Context
* Expandable support
* Added expandable tag under manifest
* Old application w/o expandable is given the default screen size ([320, 480] x density).
* The non-expandable window is centered.
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