Updates

- Updates Sheer
- Adds related posts to the posts page
- Adds popular stories to the landing page (replaces the current popular stories and renames the old one to related links)
- Adds category filter links to category slugs
- Sidebar adjustments
- Post page now uses ft img thumbnail image size
- Adds js plugin to convert one input into two ([browser/other tests](https://github.com/cfpb/cfgov-refresh/issues/72))
- Comments out the ajax pagination stuff for now (was causing issues in IE7)
- Shows a "No results for" message when there are no results for a given set of filters
- Date filters show current selection