实现 edp beautify 功能

Fix #32
- 添加依赖 cssbeautify;
- 实现edp beautify [filename]
fixed #32

add problem todo;
delete useless code;
add a newline at end of file
修正了一下jshint检测到的问题，哈哈~

1. line 9, col 84: Line is too long.
2. line 7, col 9: 'util' is defined but never used.
Merge pull request #58 from virola/master

实现edp beautify功能