Unplanned

Bug #2816: Fix cc.Loader's bug that engine doesn't work when preloading twice resource.

Bug #3276: Closure compiler doesn't remove the useless code in advance mode.

Bug #3382: Cocos2d-html5 engine memory leak on Chromium(Content Shell) on Android

Bug #3446: ClippingNode on WEBGL mode is not working

Bug #3500: Strange behavior of CCClippingNode on canvas render mode

Bug #3535: TMXLayer cache cut off some area on the map

Bug #4745: Make EventListener extendable and possible to create with new

Bug #5651: accelerometer behaviors are different between h5 and jsb

Bug #5686: Fix a bug of Armature that bone's flipped function is invalid.

Bug #5693: refactor eclipse project file to support c++

Bug #5720: Auto setTransformDirty after called setPosition,setRotation in cc.Bone

Bug #5790: refactor binding-generator to simplify the generated header files

Bug #5988: LabelBMFont#getChilren inconsistent between h5 and jsb

Feature #2139: JS file require mode for preloading

Feature #2829: Improve audio compatibility of Mobile web browsers

Feature #2831: CMCC HTML5 IAP showcase

Feature #3428: Migrate the NewLabel to Cocos-x v 3.0

Feature #3429: Migrate the Physical Integrated to Cocos-x v 3.0

Feature #3515: Add force screen adaptation to Resolution Policy

Feature #3645: NPM for JSB (JSC file generation)

Feature #3951: Add observer pattern implementation with new event dispatcher

Feature #3952: Mark HTML5 only API

Feature #3954: Dependancies management in NPM version

Feature #3955: Implement new physic engine apis

Feature #5662: bind capturescreen in jsb and add a testcase

Feature #5665: bind video widget to jsb and add a testcase

Feature #5667: Upgrade Websocket to the latest version

Refactor #2353: Improve CrystalCraze performance for mobile browsers

Refactor #2354: Improve WatermelonWithMe performance for mobile browsers

Refactor #3460: Improve performance of CCClippingNode on Canvas mode

Refactor #3607: Refactor the resource loading process to a unified class

Refactor #3944: Simplify usage of sprite animation

Refactor #3947: Simulate 'setTimeout' and 'setInterval' in JSB

Refactor #3953: String management

Refactor #4012: Try full screen meta tag to make full screen more compatible

Refactor #5683: Study new solution for overriding C++ invoked functions in JS

Refactor #5759: Refactor js-bindings projects for Cocos Engine Modularization

Refactor #5826: Create cocos engine's cocos2d-x and cocos2d-js

Refactor #5827: Move AssetsManager to JSB level

Refactor #5828: Upgrade 3.0 Cocos engine with v3 assets manager