update engine version
Revert "update engine version"

This reverts commit e2db75a86907a44f2fbce01297af8c1c680cd89e.
Merge branch 'master' of https://github.com/chukong/cocos-docs
add support for ndk r9d
Merge branch 'master' of https://github.com/chukong/cocos-docs
fixed en.md syntax error
Merge pull request #466 from honghui/master

add support for ndk r9d