Removed display lists from Hiero.

Performance isn't important for Hiero and this was causing crashes on Linux.
SequenceAction fix, #463
Better handling of removing an action during the action.

And by better I mean fixing my previous fubar fix. #463
Removed use of SharedLibraryLoader for silly GWT.
Merge branch 'master' of https://github.com/libgdx/libgdx
Removed unused computation (shadowMap).
Bug when release light with nativ implementation corrected...
Problems with diffuse lights!