A couple tweaks

Squashed commit of the following:

commit 7641e34a4cd0ab920e40b00da29f4edee7027b76
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jul 7 12:42:37 2013 -0700

    Better fix for bullets and gravatars

commit 73e1bec3bb5d44a0a651ffd42a68cb0cb8bb7d5f
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jul 7 12:27:52 2013 -0700

    Give gravatar height in css

commit 5ceac079a05c5696f71b962f0116441af185489a
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jul 7 12:15:00 2013 -0700

    Remove unused route

commit 1b941616b2d7b1b05c8c0f8f5fad92c71eb2d076
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jul 7 12:34:01 2013 -0700

    Fix poll response form
Allow teacher to specify tweet message, with default
Fix bug introduced by devise upgrade, allow user to set homepage at sign up, add test
Doh, forgot twitter oauth