Add support to GWT for GlGetInteger, glGetFloat and glGetString
Correct packing for square texture (previous code would increase the
size of the image after packing. the new one packs to square image
directly, giving better result).
Merge pull request #1261 from vbousquet/master

Add support to GWT for GlGetInteger, glGetFloat and glGetString. Fix square packing for TexturePacker