upgrade chipmunk.js to newest version
Applying canvas scaling to particles in html5 canvas rendering mode
Merge pull request #2268 from pandamicro/develop

Fixed #5942: Default event listener's paused value should be true
Merge pull request #2269 from kiwigrc/5926

Fixed #5926: Applying canvas scaling to particles in html5 canvas rendering mode
Fixes the type of the property 'placeHolder' from Number to String.
Merge pull request #2270 from claudiofreitas/develop

Fixes the type of the property 'placeHolder' from Number to String.
Merge pull request #2271 from joshuastray/chipmunk

upgrade chipmunk.js to newest version
Fixed IE9,IE10 IMG.crossOrign is not define.
Merge pull request #2279 from VisualSJ/img

Fixed IE9,IE10 IMG.crossOrign is not define.
fix UIWidget._positionPercent issue;
UILoadingBar: replaced addChild() with addProtectedChild() to add _barRenderer;
Merge pull request #2282 from mutoo/fix_bugs

Fix some bugs in ccui;
Feature #5941: Activate WebGL for iOS
TODO: need to specify version
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop
Fixed #5948: Fix touch event bug with multitouch on iOS
Remove Timeline.js
Merge pull request #2287 from VisualSJ/timeline2

Remove TimeLine.js
Create Timeline.js
Merge pull request #2288 from VisualSJ/timeline2

Create Timeline.js
Fixed #5949: Add type check in cc.loader