Merge remote-tracking branch 'chewonit/master'
Merge remote-tracking branch 'chewonit/master'
Set rotation anchor to be at center of sprite.
Added canvas clearing function.
Merge pull request #22 from teemingchew/master

Set blank background for ball bouncing demo
Merge pull request #23 from yjwong/master

Change rotation anchor to middle and added canvas clearing function.
Merge remote-tracking branch 'yjwong/master'
Merge remote-tracking branch 'chewonit/NewBranch'
Fixed a setX/setY bug in which variables are not resolved. Used sprite getX/getY instead of accessing private attribute. Checked if callback is defined before running it in queue.stop()
Bug fix for rotate
Merge pull request #24 from xcchan/master

Bug fixes
Fixed bug with negative values of setX and setY.
Merge branch 'master' of github.com:chewonit/cs3213-visual-ide-team20
Merge pull request #25 from yjwong/master

Fixed bug with negative values of setX and setY.
Merge branch 'NewBranch' of github.com:chewonit/cs3213-visual-ide-team20 into NewBranch
Merge remote-tracking branch 'origin/master' into NewBranch