Confirmation fixes

This includes the confirm email fix, a placeholder page where newly confirmed users are sent to, and the two plans for the front page that we'll decide on one for sure today.
I haven't thought through this too thoroughly, but I'm not sure this path fits within our ideal REST setup. It's okay to have non-restful actions/routes, however, the welcome page could go in the "home" controller where it might be more appropriate for public, non REST actions. The enrollments controller could stay as CRUD actions for enrollments.