Merge pull request #90 from Ivenyang/master

add online showcase for chapter 3.
delete online showcase
add more items into catalog as the docs plan.
adjust v3.0 data structures in catalog
try to create "table of contents" in markdown
Update summary_release_20140107.md
Update summary_release_20140107.md
Well, I create table of content correctly now!
Merge pull request #91 from walzer/master

Add a sample of adding "table of content" in markdown.
Merge branch 'master' of https://github.com/cocos2d/cocos-docs into gh-pages