issue #3375, add chapter 8
issue #3375,Finish the outline of the article
issue #3375, add the first section
issue #3375, add some tests
issue #3375. write the catalog
issue #3375. Finish section of packing background spritesheet
issue #3375. Introduce to tiledmap object layer
issue #3375. Refactor background Layer and add some helper methods into it
issue #3375. finish the 8th chapter of parkour game tutorials
issue #3375. upload the final sample project
fixed #3375. Finish.
Merge pull request #21 from andyque/chapter8

fixed #3375. chapter8 of parkour game with cocos2d-html5