added Node::getCascadeBoundingBox()
replaced "NULL" with "nullptr"
moved getCascadeBoundingBox() to utils
call getCascadeBoundingBox() properly
Fixed compile error when I turned off physics definitions.

Fixed the following compile error.
cocos2d\extensions\physics-nodes\ccphysicssprite.cpp(305): error C4716:
'cocos2d::extension::PhysicsSprite::getRotation' : must return a value
and more..

Conditions:
CC_USE_PHYSICS = 0
CC_ENABLE_CHIPMUNK_INTEGRATION = 0
CC_ENABLE_BOX2D_INTEGRATION = 0
Using CC_ENABLE_CHIPMUNK_INTEGRATION and CC_ENABLE_BOX2D_INTEGRATION instead of CC_USE_PHYSICS
Fixed my mistakes - preprocessor.
remove external
New Audio Engine -MAC
update lua binding
update project
add external submodule
update submodule on download-deps.py
fix noise on mac
Cocos2d-x used a deprecated method to get the content size of a CCLabelTTF on iOS 7.
add external submodule
Merge pull request #8117 from minggo/use-submodule-for-external

Use submodule for external
openUrl function for all platform but on windows RT empty function
Added method for converting from std::string to Platform::String.
Windows Phone 8 can now open URLs.