Use the new pipeline serve_static view for any static media.

Review Request #8039 — Created March 7, 2016 and submitted — Latest diff uploaded

Review Board
This makes use of the new view in pipeline for serving up static media,
handling any collecting of media that's needed in order to serve up
those files. This fixes usage with extensions.

Used this along with the change currently up for review for Pipeline.
I was able to access files that weren't yet collected, including extension
media not using the template tags.