Add better styling for time slots, dates, scores

Give Admin::PaperDecorator responsibility for formatting Papers:
* Reduce column space needed for displaying data.
* Use "traffic light" colours for scores.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Style sorting toggle with Foundation Sub Nav

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Add Bourbon Sass mixin library

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Rotate long col headers 270° in admin papers table

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Merge pull request #43 from eurucamp/feature/admin-papers-view-styling-improvements

Feature/admin papers view styling improvements