Added Documentation for LayoutChangeset class
Added a NoAnimationLayoutAnimator class that just jumps between layout changes without animations.
Fixes #37
Fixes #40
Merge pull request #41 from arpit/master

Fixes #40
Fixes #36
A little cleanup. Also added a "stopScrolling" public method.
Fixes #28 and fixes #29
Changed a private method to protected to allow classes to extend Container and do their own viewport magic.
Merge remote-tracking branch 'upstream/master'