Merge remote-tracking branch 'libgdx/master'

Conflicts:
	CHANGES
	extensions/gdx-box2d/gdx-box2d/pom.xml
	extensions/gdx-freetype/pom.xml
	gdx/src/com/badlogic/gdx/graphics/g2d/BitmapFont.java
	gdx/src/com/badlogic/gdx/math/Matrix4.java
	gdx/src/com/badlogic/gdx/scenes/scene2d/ui/Container.java
	tests/gdx-tests-lwjgl/src/com/badlogic/gdx/tests/lwjgl/LwjglDebugStarter.java