Merge branch 'libgdx_official/master'

Conflicts:
	gdx/src/com/badlogic/gdx/assets/loaders/resolvers/AbsoluteFileHandleResolver.java
	gdx/src/com/badlogic/gdx/graphics/g3d/ModelInstance.java
	gdx/src/com/badlogic/gdx/graphics/g3d/Renderable.java
	gdx/src/com/badlogic/gdx/graphics/g3d/model/Node.java
	gdx/src/com/badlogic/gdx/graphics/g3d/model/NodePart.java
	gdx/src/com/badlogic/gdx/graphics/g3d/shaders/BaseShader.java
	gdx/src/com/badlogic/gdx/graphics/g3d/shaders/DefaultShader.java
	gdx/src/com/badlogic/gdx/graphics/g3d/utils/ModelBuilder.java
	gdx/src/com/badlogic/gdx/math/MathUtils.java
	gdx/src/com/badlogic/gdx/math/Matrix3.java
	gdx/src/com/badlogic/gdx/math/Quaternion.java
	gdx/src/com/badlogic/gdx/math/Vector3.java