Merge pull request #806 from jrenner/run-header-tool

ran gdx-tools HeaderFixer tool

diff --cc gdx/src/com/badlogic/gdx/graphics/g3d/ModelBatch.java
Simple merge

diff --cc gdx/src/com/badlogic/gdx/graphics/g3d/attributes/DepthTestAttribute.java
Simple merge

diff --cc gdx/src/com/badlogic/gdx/graphics/g3d/loader/G3dModelLoader.java
Simple merge

diff --cc gdx/src/com/badlogic/gdx/graphics/g3d/utils/MeshBuilder.java
Simple merge

diff --cc gdx/src/com/badlogic/gdx/graphics/g3d/utils/MeshPartBuilder.java
Simple merge

diff --cc gdx/src/com/badlogic/gdx/utils/Bits.java
Simple merge