Add password recovery functionality #37

Add functionality to allow the recovery of a forgotten password.

1. Add action to controller to render a password recovery page if the request is GET. If the request is a POST, create a unique token associated with the user id or email and send an email to the user with a link to reset the password. The link will route to action 2 below
2. Add action to controller to allow the user to enter an new password if the token is valid. Destroy token when done.
3. Add the views for action 1 and 2 above
4. Add adapter to handle the creation, deletion and validation of tokens
5. Add options (token expiration, etc.)

I have already implemented this in my application. I will pull in a generalized version