Scope lessons index to current school
Take out caching that only makes it slower
Improve test
Bundle update

Squashed commit of the following:

commit 2bab6974857cecc98ef70252632ae7476f1033d8
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jan 5 18:59:47 2014 -0800

    Bundle update

commit 98c7c85dba5e9690cd2c9965b1c8b86e00a2801c
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jan 5 18:50:13 2014 -0800

    Bundle update devise

commit 8f8561398a67974a8b9add66dc9c6d04c36bdc2a
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sun Jan 5 18:40:05 2014 -0800

    Bundle update rails
Fix LessonTweeter
Upgrade to Ruby 2.1.0