closed #4424: fix PhysicsBody::setGravity() doesn't work correctly sometimes.
closed #4424: change name _enable->_enabled, _rotationEnable->_rotationEnabled, _gravityEnable->_gravityEnabled
closed #4419,  Backup the environment  file when adding environment variable in setup.py.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
fix lots compile warnings
remove unused params warnings
fix lua bindings warnings
add id return value to LuaObjectCBridge
rollback the scheme mode of projects
close #4400: Use the newest version of LuaSocket for lua
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop_socket
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
closed #4462: Wrong logic in CCBAnimationManager::moveAnimationsFromNode.
close #4400: Update the anrroid.mk for lua-bindings
Merge pull request #5887 from andyque/fix_tests_warnings

Fix warnings in cpp-tests.
Merge pull request #5890 from dumganhar/iss4462-ccb

closed #4462: Wrong logic in CCBAnimationManager::moveAnimationsFromNode...
Update CHANGELOG [ci skip]
Merge pull request #5854 from boyu0/iss4424_setgravityenable_fix

closed #4424: fix PhysicsBody::setGravityEnable() doesn't work correctly sometimes
Update CHANGELOG [ci skip]
Merge pull request #5882 from natural-law/develop

Backup the environment  file when adding environment variable in setup.py.