Badges in projects and DataTable in list pages

- Added CodeClimate, Travis and Gemnasium badges to projects list
- Added DataTable style to servers and installations list pages
I think that the travis-ci badge should show up in the first position, as it is the most important;

I'm don't like the "onerror:" method very much, as it's mixing javascript with the html, which is not a best practice. I think we should just use the "alt" attribute, which is also a more **accessible** way to handle an image not found (read: http://www.w3schools.com/tags/att_img_alt.asp )