参考资料
https://bitbucket.org/wiredesignz/codeigniter-modular-extensions-hmvc/src/fecd39ccdf56?at=default
http://ilikekillnerds.com/2010/11/using-smarty-3-in-codeigniter-2-a-really-tiny-ci-library/
https://github.com/Vheissu/Ci-Smarty
