Added hashCode to Quaternion

Quaternion was only overriding `equals()`, but not `hashCode()`. The methods are generated with Eclipse and slightly changed to make them shorter and keep the same behaviour of the old `equals()`.
Added function to add an asset to the AssetManager
Added function to retrieve all the assets of a give type
Rename get to getAll AssetManager
Removed function to add an asset to the AssetManager
added PolygonRegionLoader for the AssetManager from libgdx-utils
fixed NPE in PolygonRegionLoader#getDependencies(..)
made javadoc for Input#getX() and getY() more understandable since it caused confusion
Preliminary changes to AndroidApplicationBase propaedeutic for massive code reuse on Graphics classes
Made code reuse in methods initialize and initializeForView propaedeutic for upcoming changes
Removed isFragment method; let's use a specialized audio lifeclycle listener instead.
Unified AndroidGraphics class for activity, fragment, and daydream;
extended for live wallpaper.
Fixed fragment lifecycle (hopefully).
Fixed wrong invocation to setPreserveEGLContextOnPause via reflection.
Fixed perfect reflection on collision
Removed redundant null checks.
Isolated GLSurfaceView instance details according to information hiding
principle.
added war contents
who sucks? Mario sucks...
fixed up location of core.gwt.xml
not my day...
Merge pull request #1572 from lordjone/assetmanager

AssetManager Additions