add ‘about html5’.
Merge pull request #131 from u0u0/master

add four tutorials.
add ‘cocos-utils-for-npm’.
add article getting-started_with-cocos2d-html5.
add article moonwarriors-cocos2d-html5-showcase.
add release note and ‘understand-the-resolution-policy’.
add upgrade-guides-html5.
add articles to catalog list.
Merge pull request #132 from Ivenyang/master

add html5 articles.
add "About CocoStudio".
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
add "Contribution"
add "architecture and directory structure"
add "supported platforms and programming languages"
add "Android and NDK"
add "Bada Environment Setup"
add "BlackBerry Environment Setup"
add tutorials to catalog.
add "Emscripten usage"
add article of iOS test.