Merge pull request #62 from sklaman/master

use LinkedHashMap to maintain draw order of views as added to FreeFlowCo...
Fixes Bug #60 : Touchups only trigger if the down and up happen on the same item
Added a new method "notifyDataSetChanged" that
will update any current views being rendered by the Container
dataInvalidated now takes a parameter to decide whether it should reset the scroll positions. The older behavior is preserved without params but the method is deprecated
Added a utility class
null check
removed accidentally committed log messages
Merge pull request #66 from arpit/master

Updates
Added a "onContainerTouchDown" callback for when container is touched while animating.
Merge pull request #67 from arpit/master

Added a "onContainerTouchDown" for when container is touched while animating.
Added a utility method for finding screen sizes
fixes FreeFlow issue #49 - layout weights in xml were preventing the drawing of child views