Add skeletontest
AndroidSound#play/loop now returns -1 on failure, to match other backends
Default to GL_REPEAT, add mtl shininess and opacity, fix BlendingAttribute constructor
Fix MeshBuilder#box
Fix GLES10 shader
Fix OSX backspace behaving like delete key due to bug in LWJGL Keyboard.getEventCharacter()
Fix opacity on models
fixed cuboc
Fixed long presses behaving incorrectly.

Fixed long presses causing events not to be consumed by the
GestureDetector. This issue was causing the GestureDetector to return
false in touchDragged and touchUp whenever a longPress returned true
resulting in unexpected behavior which one would likely only notice when
chaining InputProcessors in an InputMultiplexer.