Added boolean forceSquareOutput for Settings. This can be used to make
sure that the output images are squares. My main motivation: In OpenGL
ES 1.0, mipmaps require square textures.
Changed the commit according to Seraphim6x7 suggestion.
Merge branch 'master' of https://github.com/libgdx/libgdx.git
Clamping for value in setRange.
Allow min to be same as max.
If min is the same as max avoid division by 0.
Committed again the same changes to with the Nates fixes.
Merge pull request #213 from indiumindeed/master

Fixes to Slider and TexturePacker2