Lua增加ccbi

function AddCCBI( str ,parent, ptr,  pos, tag , zorder)
local loader = CCNodeLoaderLibrary:sharedCCNodeLoaderLibrary()
local reader = CCBReader:new(loader)
reader:autorelease()
local node = reader:readNodeGraphFromFile(str, ptr)
node:setPosition(pos or ccp(0, 0))
parent:addChild(node, zorder or 0, tag or -1)

return node
end