Allow filtering on just audio or video
Add markup for media filters
Merge remote-tracking branch 'upstream/4.0_template' into issue-126
Don't allow the setting of `additional_filters`
Fix pager to work with selected media type

Include the additional filter in the getURL method
Only add the 'q' parameter if we are in a search
Always show sort/filter options

This way they are visible id no media could be found.
Merge pull request #155 from mfairchild365/issue-126

Implement media type filters