Clean up file browse view a bit

Summary:
  - Use DiffusionCommitQuery
  - Get rid of the "Author" column.
  - Collapse commit + revision together.
  - Better tooltips to cover for the removed information.
  - Colorize only the "line" column.
  - Generally, reduce the amount of visual noise and non-code-stuff going on in this interface.
  - I'd like to make the "<<" thing look nicer too but that might take some actual design.

Test Plan: See screenshots.

Reviewers: btrahan, chad

Reviewed By: chad

CC: chad, aran

Differential Revision: https://secure.phabricator.com/D7457