Add box-shadow around media on view page

This addresses the concerns raised in #343.
Merge pull request #345 from MediaCrush/box-shadow

Add box-shadow around media on view page
Added invocations
Fixed a format string
Merge pull request #348 from MediaCrush/invocation

Added invocations
Merge branch 'master' into thumbnails

Conflicts:
	mediacrush/worker.py