Reworked all templates to match Bootstrap V3 markup

* Rebuild the welcome (no servers) page
* Reworked markup of all modals (not working with "hide" class)
* Refactored refresh-button-event in JS
Changed preview image
Merge pull request #51 from phogl/bootstrap-update

Updated UI - Bootstrap 3.2.0
Updated UI - Bootstrap 3.2.0 (continued #51)