issue #3781, Don't set a default PYTHON_ROOT & NDK_ROOT for user on Windows.
Merge branch 'develop' of git://github.com/cocos2d/bindings-generator.git into issue#3781
issue #3781, Tips user on enviroment variables are ont defined.
Merge pull request #73 from lihex/issue#3781

Don't set a default PYTHON_ROOT & NDK_ROOT for user on Windows