Stage.act() calls requestRendering() if any actions are added or fired (fixes #2228)
Stage#setActionsRequestRendering will animate actions when setContinuousRendering is false.
changed setActionsRequestRendering() to a static method
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.
Fixed ButtonGroup not removing from the checked buttons list.
Keep names for drawables to make debugging easier.
Make Button use padding of all drawables, not just the first.

#2322
Merge remote-tracking branch 'origin/master'
Have Button update background in setStyle.

closes #2322
Fixed copying TintedDrawable.