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.
Merge branch 'master' into PG
[Cocos2d-JS PG] Added docs for Lite Version Workflow
[Cocos2d-JS PG] Complete docs for Lite Version Workflow (en and zh)
Update en.md
Update dialog-share.md
Merge pull request #7 from tczbzb/patch-7

Update en.md
Merge pull request #8 from tczbzb/patch-8

Update dialog-share.md
Update zh.md
Merge pull request #1 from joshuastray/refactor_fb_doc

Refactor fb doc
Update en.md
Update en.md
Update dialog-share.md
[Cocos2d-JS PG] Add 2.2 Cross platform workflow Chinese doc
[Cocos2d-JS PG] Add 2.2 Cross platform workflow English doc (Unfinished)