Proper support for onAttachedToWindow and onDetachedFromWindow methods on Android 2.x
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
Merge remote-tracking branch 'upstream/master'
Rename get to getAll AssetManager
Removed function to add an asset to the AssetManager
Update to meet commit e4d6a4e.
Ops... added missing import
LiveWallpaper: added proper support for attach to and detach from window on Android 2.x
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
*.jar files are not ignored by default

This caused gradle-wrapper.jar to not be included in the project repo thus defying the whole purpose of using gradlew.
Also needed for libraries that still have to be added manually.
Merge pull request #1557 from davebaol/master

Proper support for onAttachedToWindow and onDetachedFromWindow methods on Android 2.x
Merge pull request #1648 from wmora/master

*.jar files are not ignored by default
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.
Update AdvancedSettingsPanel.java
Fixes #1647