Change of name in shaders to take into account the new images
Removed tween engine as it can be easily replaced by the existing interpolators.
Import warnings fixed.
Build script modified. The tween engine library does not exist any more (3ea7b749cf73c9e9cb2f250db65b62e75aa0a1a6).
Travis build updated. The jar file is now exported as default.
Merge pull request #3 from hevs-isi/master

Cleanup