template aussenborder

(PR is against `grunt` branch for testing)

Why?

- Automation: Server and Sass compile (with sourcemaps and via `bundle exec`) in one command
- [CSS Lint](http://csslint.net/): gives us control over template css. This way we can protect the cms from things like: styled elements, star selectors, !importants, etc. We could also parse on submit and reject templates with cms-dangerous styles.

Also added:

- Gemfiles to keep track of used Sass and Compass versions. More control so less possible bugs for designers.
- gitignore: always good to have

To play with CSS Lint, see the options explained here: http://csslint.net/about.html

TODOs if want in master:

- configure CSS Lint
- update Readme
- squash commits for easy cherrypicking into other template repos

PTAL @ldiercks @HerrBertling @Heyerlein 

:beers: