change tutorial ’ how_to_invoke_android_api_in_cocos2dx’ and add it to catalog.
Merge pull request #60 from Ivenyang/master

fix issue #3520 tutorial ’ how_to_invoke_android_api_in_cocos2dx’ and add it to catalog
modify spell.
add sample code for chapter6.
Merge commit '7478fd8d6181491ddab9c4515acfa20d2fbeec72'
Merge pull request #61 from Ivenyang/master

fix issue #3347 modify chapter 6.
add sample code for chapter7.
Merge commit 'd405002915c145614a2518beed10f89c2e500c68'
Merge pull request #62 from Ivenyang/master

fixed #3305, add chapter7 sample code.
issue #3493, correct grammar,  correct doc coding style.
Merge pull request #63 from u0u0/master

issue #3493, correct grammar,  correct doc coding style.
modify the title of JSB doc
issue #3347, min.js have not include chipmunk, fix running error.
issue #3350, min.js have not include chipmunk, fix running error.
Merge pull request #64 from u0u0/master

issue #3347, min.js have not include chipmunk, fix running error.
issue #3493, fix Cocos2-html5 2.2.1 music play bug.
issue #3375, add sample code for chapter 8.
issue #3435, add sample code for chapter 9.
issue #3493, add sample code for chapter 10.
issue #3471 add one article about map