Fixes and changes for Alaveteli 0.17

This pull request contains all changes needed for the upgrade to Alaveteli 0.17:

1. Changes to bring the repository in sync with what was installed on the production Ask the EU site.
2. Fixes to the production theme (removed invalid @fontFamily tags for example).
3. Changes needed due to differences between Alaveteli 0.12 and 0.17 - mostly the asset pipeline changes in 0.16.

Please accept this pull request before doing any more work on the theme.