update facebook sdk on android documents
modify the step5
modify en md
Improve Facebook integration on Web
add document for compilation in eclipse
Improve Facebook integration on Web
fix title to uppercase
Merge pull request #536 from joshuastray/master

add document for compilation in eclipse
Merge pull request #535 from jianglong0156/master

Improve Facebook integration on Android
Merge pull request #534 from pandamicro/master

[Cocos2d-JS] Improve Facebook documentation
[Cocos2d-JS] Docs for 3.1 beta release
Merge branch 'master' of https://github.com/cocos2d/cocos-docs