R1:e8205a2d1ec6

Improve actions for binary files and images in Diffusion

Summary: We currently render something kind of goofy; integrate these with the other actions.

Test Plan: Viewed `aphlict.swf`, some PNG in Diffusion.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7052