Draft for libGDX Pay API.
Purchase object improved to accept both an integer or String in the constructor for the item identifier.
Merge branch 'master' of https://github.com/noblemaster/libgdx into iap
added gdx-pay to build
Merge branch 'master' of https://github.com/libgdx/libgdx
Merge branch 'iap' of https://github.com/libgdx/libgdx
Pay API:
 - removed PurchaseObserver - there is now only 1 single listener: PurchaseListener
 - itentifier changed to String (from int).
Merge branch 'iap' of https://github.com/libgdx/libgdx
Added payment processor stubs for Google Wallet/GWT and Stripe/Desktop.
avoid raw Types when dealing with scene2d Cell

add generic types to more things in Table.java

fix error

fix error again because im bad
Merge branch 'master' into p3d

Conflicts:
	gdx/src/com/badlogic/gdx/math/Matrix4.java
Merge branch 'master' into p3d

Conflicts:
	gdx/src/com/badlogic/gdx/math/Matrix4.java
removed explosion
Merge branch 'p3d' of https://github.com/lordjone/libgdx into lordjone-p3d
updated changes
Merge branch 'iap' of https://github.com/libgdx/libgdx
removed iap extension from master, what was i thinking...2
updated to release version 1.2.0
GWT Compatibility
Merge pull request #2014 from Tom-Ski/master

Allow centering on either axis fixes #2001