Make GWT happy.
Merge pull request #417 from xoppa/master

Remove non working test models, add Basic3DTest, rename ModelTest
Add classpath files support for gwt (limited)

Classpath files, such as the default bitmap font and the default shaders
for the new 3d api, are now available in gwt. This limited support
requires the classpath files to be specified in the gwt module definition
by setting the multi-valued property 'gdx.files.classpath'. Any file
specified will be copied to the assets folder at compile time.
Let InputStream subclasses report available bytes.
Remove commented out line
fixed LwjglDebugStarter, was refering to renamed NewModelTest
added g3dj to DefaultAssetFilter for faster loading, fixed GWT AssetManager emu for ModelLoader, hacked GwtGL20 to return max texture units (always 16, hackady hack)
Added a some logic for specifying values that the slider can snap to.
Merge pull request #419 from aspic/master

Snapvalues for Slider
fixed GwtGL20, cleaned up buffer handling in dev mode, may the fsm have mercy on us
Add default shaders to ant build.
Merge branch 'master' of https://github.com/libgdx/libgdx
Make extension check case insensitive

Fixes issue 1467.
Merge pull request #418 from xoppa/master

Make it easier to specify a shader, add Material IntAttribute, face culling, opacity and shininess