Ui improvements (PR included)

Please find a PR containing an UI refresh, basically : 
* Added "table-condensed" class to all tables to reduce cell padding
* Major rework on Check page (most of the actions are now available from a single place, reduce number of colors in buttons, labels ... to make the page less eye disturbing, set check name as "title", moved graph thumbnails to have them "visually" included in the check details).

Screenshot :
![seyren-ui_improvements](https://f.cloud.github.com/assets/186018/1607187/154897c0-5475-11e3-9c94-ab01e0199d86.png)