A large pile of changes resulting from a trans-continental half-day hackfest!

Hi! Sam (@samwho) and I spent a few hours yesterday working on Earthquake. This pull request includes all of our published changes, including:

 * Adding support for "count" when using :recent (though not for lists as the twitter-oauth lib doesn't support it and I was unsure about extending it to do so)
 * Supporting, and preferring, invoking the editor defined in the "VISUAL" environment variable, falling back on "EDITOR" if unavailable (Gvim over Vim, for example)
 * Expanding plugin support to include listing installed plugins, viewing their source, uninstalling them, and stubbing out support for installing outside of GitHub Gists (mainly for development purposes, and it is shipped disabled in the config)
 * Support choosing whether to see errors printed in the CLI instead of notification service (which was enormously confounding!)

Let me know if you have any questions!

Cheers,
Trevor