Add sorting drop-down to posting index.
Make sure that two drop-downs can't be open at once.
Implement very basic sorting.
Highlight current sort value.
Clean up postings page for easier readability.
Set up sorting by status, and first rule of sorting by importance.
Add second rule for importance-sorting.
Add third rule for importance sorting.
Add final rule for importance sorting and set as default.
Clarify 'posted' and 'added' sort types by adding 'date' prefix.
Correct behaviour of expander arrow swap when clicking outside element.
Fix error in 'schedule new interview' page.
Fix newline spacing issues.
Don't show sort button for archived posts.
Merge pull request #74 from sarahsemark/sort-postings

Sort postings
Install and configure Capistrano.
Add mysql2 gem and temporarily use this deployment-system branch for deploys.
Remove branch-specific data from Cap setup. (Should specify branch via CLI.)
Add mysql gem, just for kicks.
Test new gemfile.lock