premultiplied alpha for PNG,TGA,WEBP,RAW_DATA
no need for handling RAW_DATA
we are only udpating PNG now.
add test case to break buggy code
bugfix related to AutoreleasePool's PoolManager

* duplicated AutoreleasePool added to PoolManager in
  PoolManager::getInstance()
* redundant pop_back() in PoolManager::~PoolManager()
remove unnecessary cache-variable
prefer std::vector to other containers
Merge pull request #6954 from visiblelight/AlphaIssues

Make PNG files premultiplied alpha when loading
[ci skip]
remove sortChildren of Layout
refactor ListView, add do Layout
surround tolua_isnumber with debug flug
fix layout constant syntax error
closed #5482: fix issue: Node::setPhysicsBody() doesn't work after node added to other node.
closed #5482: add a test case for bug 5482.
Merge pull request #6963 from andyque/refactorLayout

refactor Layout, remove sortChildren and unify doLayout
Merge pull request #6969 from boyu0/bug5482_setPhysicsBody

closed #5482: Node::setPhysicsBody() doesn't work after node added to another node.
[ci skip]
[AUTO]: updating luabinding automatically
Merge pull request #6970 from CocosRobot/update_lua_bindings_1401861401

[AUTO]: updating luabinding automatically