fix: copy map when getParseCallBackMap() and getParseObjectMap()
add GUIReader::registerTypeAndCallBack for std::function
replace NULL to nullptr

fix compile error
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
fix indent
remove resources for unused.
temp backup
dynamic update index for quad command
add triangles command, make quad command inherit from triangles command
Renderer Only knows about Triangles Command, every command  inherit from Triangles Command can be batched
Merge branch 'v3' into v3_trianglesCommand
Merge branch 'customguireader' of https://github.com/lite3/cocos2d-x into customguireader
Merge branch 'v3' into customguireader
Merge branch 'v3' into customguireader
add CustomGUIReader for lua
skip GUIReader::registerTypeAndCallBack for lua bindings
fix ccs.CustomGUIReader not in ccs table
put TrianglesCommand in a seperate file