Biography cleanup

#56 - Biography updates to user platform (and link to the new biography page from people pages)
#60 - Forgot password and better sign in links for the user platform
It *might* make more sense to have a separate template in `app/views/biographies/new.html.haml`... not sure if it's the right choice, but want to put it out there for consideration. Ideally you shouldn't have to do much branching on child type in parent views.