Merge pull request #181 from nazgee/for-nicolas-ETC1-TP

Add support for ETC1 textures
Updated classpath.
Added clear method to Library.
Minor optimization where using the StringBuilder class.
Added a few more TimeConstants.
Made CatmullRomMoveModifierConfig static.
Minor changes.
Minor changes.
Merge remote-tracking branch 'nicolas/GLES2-AnchorCenter' into GLES2-AnchorCenter