Add luac format and checking line width information

Add luac format and checking line width information, make the output easier to understand.
Output example:
![lua-releng](https://f.cloud.github.com/assets/3169925/1877661/4f0d678e-792c-11e3-8081-2b5d1d89358c.png)

-----------
加了一些增强输出可读性的打印信息。