Updates lua-bindings.
remove thread pool header including.
Merge pull request #46 from pandamicro/AssetManager

Remove temporary manifest file if no longer needed and Remove writable path dependancy
rename file fix in AssetsManager
Update submodules
Merge branch 'lua-vm' of https://github.com/dumganhar/cocos2d-x into v3_assets_manager
Merge pull request #47 from pandamicro/v3_assets_manager

Update submodules