fix assetsmansger path
build release version of android samples
Merge pull request #4053 from minggo/iss2905-adjust_folder

[ci skip]Iss2905 adjust folder
Don't set debug flag in AndroidManifest.xml.
fix a bug when building AssetsManagerTest
Merge pull request #4054 from dumganhar/develop

Don't set debug flag in AndroidManifest.xml.
Merge pull request #4055 from minggo/iss2905-adjust_folder

fix a bug when building AssetsManagerTest
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop_dirty