Lua bindings

Generator scripts for lua. This pull request contains 3 commits.

1. copy base file
Copy `${COCOS_ROOT}/tools/tolua/genbindings.py` and `${PLUGINX_ROOT}/tools/pluginx-bindings-generator/tojs/cocos2dx_pluginx.ini`

2. modify scripts for lua
Edit configures like file path.

3. add generated code
Add result code by running scripts.

Note: This script skip all methods that use structure for pluginx (like TProductInfo) because it need manual conversion settings and code. Also skip listener methods (like setResultListener). I plan to implement these methods at next pull request.