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.
Removed a non existant model

This model does not exist (anymore). When it is selected via the UI of the test, the test crashes.
Merge pull request #1967 from nooone/patch-1

Removed a non existant model
Skipped color markup when computing font metrics.
Merge pull request #1968 from davebaol/color

Skipped color markup when computing font metrics.
Removed Skin#add(String, Object) to reduce confusion about under what type the resource is added.

#1957
Meh changed my mind.

:D Made lots of code too verbose.
#1957
Adding mapping file for FireTV

Has String ID and all controller mappings for the Amazon Kindle Fire TV
controller as tested on real device.

Also contains a check to see if the device you are running on is a Fire
TV.
Update to mapping file for the Ouya

Updated mapping as some values were incorrect. (L1 and L2 were swapped,
same with R1 and R2). Changes tested on a real device.

Removed conditional mapping, as I don't think it is a good idea.
Ouya.BUTTON_O should always return the same value in my opinion,
previously it would return one value if it running on an Ouya device,
another if it wasn't.

Adding the ability to "simulate" running on an Ouya device for testing
purposes. E.g. In my application I show device specific artwork and I
mainly test on my PC. I was careful to maintain backwards compatibility
with this, so it will not break any one's build who was using the
"runningOnOuya" boolean
Implement material attribute hashcode
Merge pull request #1975 from xoppa/various

Implement material attribute hashcode
Added a FreeTypeFontGeneratorLoader.