Style private messages. Closes #20.
Minor fixes to Handlebars helpers.
Improvements to jQuery gravatar plugin -- tooltip, size.

Adding the size parameters makes a big difference to the display if you
lose your internet connection... which shouldn't happen during the hunt,
but happens often when I'm hacking on the T.
Update to Meteor 0.6.3 -- 'limit' is now supported in queries!
Improve chat appearance in header.
Agressively add tooltips with the real name to places where we use nicks.
Tweak breadcrumbs display to make it easier to navigate to/from chat.

Removed the chat room edit textbox in the process; make add a button and
dialog for this if we really need faster chat room navigation?
Improve display on narrow screens.
Add favicon and images flanking the home page <h1>.
Use webfonts so that layout is the same everywhere.
Fixes for mobile.  Add viewport meta tag, etc.