gdx-pay project files added.
Merge branch 'master' of https://github.com/libgdx/libgdx into iap
Latest libGDX-Pay sources/files.
Initial IAP-code for Google/Android. Needs work...
Merge branch 'master' of https://github.com/libgdx/libgdx into iap
Remove gdx-ai from core repo
IAP/Google Android: documentation update.
Merge branch 'master' of https://github.com/libgdx/libgdx into iap
Update for GdxPay (does not compile!).
Update for offer to allow chaining.
Further updates to IAP/PurchaseManager.
Add isCatchBackKey to Input interface
Minor IAP updates/changes (does NOT compile!).
Added getLevel and getIndentationSpacing.
Javadocs.
Merge remote-tracking branch 'origin/master'
Javadocs.

#2326
Bugfix for Viewport.getPickRay
Merge pull request #2327 from nooone/viewportpickray

Bugfix for Viewport.getPickRay
fixed PolygonRegionLoader GWT compatibility and error report

removed call to Class#getSimpleName() for GWT compatibility
throws GdxRuntimeException instead of logging to Gdx.app.error(..)