some optimize and css merge support

- upgrade the doc
- add reference for merged style to `index.php` under template folder
-  remove the sample `foo.js` file
- fix regular expression in both index.js and  `fis-conf.js`
- add css merging rules to `fis-conf.js`
- remove the reference of sample js file `foo.js` from template file
- optimize the gruntfile to get better code format after generating
upgrade the version