Implement kth order selection algorithm in new class Select

classes Select, QuickSelect and Array.selectRanked method
Merge pull request #733 from jrenner/quickselect

Quickselect (find Nth ordered statistic in mostly linear time)
Added panStop to GestureListener.

Otherwise trying to determine when a pan stopped was tricky.
Merge branch 'origin/master'
Some cleanup regarding stream closing.
Merge pull request #754 from hneuer/streams

Some cleanup regarding stream closing.
Expose source ID for desktop usage.

http://www.java-gaming.org/topics/libgdx-request-expose-openal-sourceids/30788/view.html
Merge branch 'origin/master'
fixed fetch script
Merge branch 'master' of https://github.com/libgdx/libgdx
Javadocs
Merge pull request #756 from hneuer/refjd

Javadocs
Added button table to Window title bar.

closes #755
Format, warnings.
Update CHANGES
Merge pull request #757 from jrenner/patch-1

Update CHANGES
Fixes #758 - GWT compile errors
do not allow MipMapGenerator instantion (only has static methods)
Merge pull request #759 from jrenner/mipmap-constructor

do not allow MipMapGenerator instantion (only has static methods)
Added IntSet to gwt Module