Feature #5972 : add build_native.py for android template
Feature #5972 : remove useless code of android java build
Refactor #5973 : update Readme in android template
issue #5972: add document comments
Merge pull request #832 from joshuastray/develop

Feature #5972 : add build_native.py for android template
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-js into develop
Merge pull request #831 from pandamicro/develop

Fixed #5943: Fix a issue of cached texture loading
Update plugin-x
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-js into develop