[mod] add a base.haml
[enh] redirect to professor dashboard on login
[enh] same for student
[enh] list classes on prof dashboard
[enh] yay, add form to add class
[enh] add a page to list students of a lesson
[enh] add empty navbar for style
[mod] change way of importing forms module
[enh] new form to create a new student to add it to a lesson
[enh] new helper function to generate a random password
[fix] use django correct way to create new user for students
[doc] add a TODO