Update Xcode project for ImageControl and missing lua sources
Merge pull request #906 from sgrenier/next

Next
Merge pull request #907 from seanpaultaylor/next

Update Xcode project for ImageControl and missing lua sources
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.