Quick fix for default source and destination regions for ImageControl.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Merge pull request #908 from ablake/next

Quick fix for ImageControl default regions.
Added public methods on ScriptController for registering and unregistering global script callback functions (i.e. initiailze, finalize, update, render, touchEvent, keyEvent, etc). Multiple registered functions per callback are now supported and scripts can register themselves.
Updated gameplay lua script bindings.
Merge pull request #910 from sgrenier/next

Added public methods to register global script callbacks