Updated chapter 6 to cocos2d-js v3.0
updated catalog
upated chapter 7 to cocos2d-js v3.0
added missed image of chapter 6
updated catalog for chapter 7
Updated chapter 8 to cocos2d-js v3.0
Updated chapter 9 to cocos2d-js v3.0
updated chapter 10 to cocos2d-js v3.0
updated catalog
Merge pull request #296 from linshun/master

Updated chapter 6-10 of Parkour tutorials to cocos2d-js v3.0