Fix to show staff role for staff_feed.html

Copied the staff_role to the staff page in models.py (since it was in the
parent model) and changed {{ staff }} to {{ staff.staff_role }} to
staff_feed.html
Add hashtags to have links to filtered content

This modifies only two files: filters.js to update the hashtags in url
whenever the selected filters are changed in a page and site.js to read
the hashtags when the page is loaded and update the filters with the
hashtag values. Empty filter values won't be visible in the hashtags. This
needs testing.
Fix a minor bug in hashtag creation

updateHashTags has to run after updateFilters has finished. Because
updateFilters is async, updateHashTags has to run at the end of the
updateFilters function. Also the hashtag part in the url was changed
to /#/? and all console debug has een removed
Small fix at rca/models.py

The RcaNowIndex wasn't using the run_filters function for the area which
resulted in the area filter in this page having all options even when they
did not correspond to an RcaNowPage
Remove hash completely when no filters are enabled
Merge pull request #6 from spapas/feature/filter-links-t513

Implementation for ticket 513