Enable asset compliation

- we fix the bootstrap-sass since the newer version
  seems a bit buggy
- we fix the glyphicons-* to app asset images so we
  can add them to the application.css.scss and override
  the asset-url
- we serve the static in production mode since
  we want to run on thin in production mode and
  nginx and apache will not do it for us
- remove ugly white space
Merge pull request #43 from kmerz/thin

Enable asset compliation