Email course alerts

Woo! #124 is finally done. Unfortunately our version of font-awesome is too old to have the [filled-in bell icon](http://fortawesome.github.io/Font-Awesome/3.2.1/icon/bell-alt/) so I've just used an [X](http://fortawesome.github.io/Font-Awesome/3.2.1/icon/remove/) icon. Upgrading to FontAwesome 3.2.1 started screwing around with a bunch of other icons on the page (shortlist buttons), so for now I've decided to leave things as is and just get the core functionality shipped.

There are some transient issues (`Object [object Object] has no method 'on'`) with the profile page related to jQuery and Bootstrap but I am having trouble consistently reproducing them - if they surface on anyone else's machine, please let me know.