Remove contenteditable gem
Replace selenium with poltergeist

Squashed commit of the following:

commit ed30c24e835002b0bd8d65c56f091808c2cfa1c7
Author: Gabe Kopley <gabe@coshx.com>
Date:   Fri Jan 3 17:32:25 2014 -0800

    OK

commit ae4cb0446e6f470412b416fc630ab2e57699f1cb
Author: Gabe Kopley <gabe@coshx.com>
Date:   Fri Jan 3 17:12:20 2014 -0800

    Close!

commit e9adb92cf7887b742a117d4261cb7e2ee76bb3ee
Author: Gabe Kopley <gabe@coshx.com>
Date:   Fri Jan 3 16:34:00 2014 -0800

    WIP

commit 6a0de036afc6bf0fb6670ca39d61829b2e61cadb
Author: Gabe Kopley <gabe@coshx.com>
Date:   Fri Jan 3 16:12:30 2014 -0800

    WIP?

commit e66a8305fa65756584b5642bf2178d5ed3d2e1b2
Author: Gabe Kopley <gabe@coshx.com>
Date:   Fri Jan 3 15:57:29 2014 -0800

    Almost done

commit 9ae80e05a9ab05389d831f651218048eeaa5052d
Author: Gabe Kopley <gabe@coshx.com>
Date:   Sat Dec 21 22:09:30 2013 -0800

    WIP
Remove feature to expand/collapse lesson details via javascript
Remove i18n-activerecord