Use normalsized font sizes in AphrontTable

Summary: Updates to use the standard 13px size we use everywhere else, cleans up a few mobile/display bugs, adds a hover state for tr.

Test Plan:
Review Diffusion, Daemons, Almanac, People Logs, anything else?

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18088