fixed potential(?) bug where temporary lua variables were left on the stack after calls to lua_len
fixed invalid sprite clipping
fixed TextBox caret image aspect ratio
Merge pull request #1106 from reven86/next-clean

Bugfixes
Update README.md
Merge pull request #1105 from bpbromberg/next

Fixed missing lua_pops after calls to lua_len
Update README.md
PlatformAndroid: Map back button to Esc key in android.
Fixed sample builds for Android

Default target for Android builds is armeabi-v7a for a while, updated
the samples to build with that.
Merge pull request #1111 from rgngl/androidBackButton

PlatformAndroid: Map back button to Esc key in android.
Merge pull request #1112 from rgngl/samplesAndroidFix

Fixed sample builds for Android
- Fixed an error in Matrix::createOrthographicOffCenter.
- Changed orthographic camera mode to have an origin of bottom left, with +Y up and +X to the right.
- Added configurable character spacing to the Font class.
- Changed Scene:addNode and Node:addChild to add nodes to the back of the list instead of the front, so that traversal order matches the order in which nodes are added.
- Added support for creating hierarchy (child nodes) in a .scene file.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next

Conflicts:
	gameplay/src/TextBox.cpp
Merge pull request #1119 from sgrenier/next

Misc changes and fixes
Merge branch 'next' of github.com:blackberry/GamePlay into next