Added chapter 1. About Cocos2d-JS
Added chapter 2. Working environment and workflow
Added chapter 3. Jumping into Cocos2d-JS (A simple game without explanation)
Added chapter 4. Essential conceptions
Added chapter 5. Cocos2d-JS features.
Added chapter 6. Advanced topics.
Added english version of Cocos2d-JS introduction.
Added chinese version of Cocos2d-JS Introduction.
Added english version of Where to get help.
Added chinese version of Where to get help.
Improved the introduction.
Fixed the draft.
Fixed the draft.
Fixed the draft.
Improved the draft.
Merge pull request #524 from linshun/master

Added original draft of Programming Guide.