Merge pull request #623 from photonstorm/dev

Fixed the 'short cut' version of Math.floor in setTransform
Fixed cross domain bug
InteractionManager now traverses in reverse when looking for a hit-test. This produces more accurate results with layered containers.
Adding grunt-watch into Gruntfile and package.json. watch uses source maps for development
Merge pull request #631 from mattdesl/grunt-watch

Grunt Watch to use concat_sourcemap
Fixed AssetLoader undefined evt.loader
Merge pull request #632 from ekelokorpi/dev

Fixed AssetLoader undefined evt.loader
Merge pull request #630 from mattdesl/interactionmanager-fix

InteractionManager hit test now checks bottom-to-top
Fixed bug where hitArea was being checked after the children hitTest