Jenkins 24030 - modernize the tabBar and project view

This PR tries to modernize the tabBar and projectview a little (nothing major).

![screenshot 2014-07-30 17 53 49](https://cloud.githubusercontent.com/assets/429311/3752732/1d9845f6-180b-11e4-9f16-386501fa9c3e.png)

Tabs look less 1990s and the project view table (bigtable) doesn't have borders/lines while theres a light background color aligned with the job status.