login: successful login: redirect to user's own page
login: add logged-in-user helper methods

These methods give Fido awareness of who is logged in as the
"current_user".
login: add sidebar

The contents of the sidebar change depending on whether Fido detects the
client has logged in as a user.
login: fix logout path

This was a simple copy/paste error.
login: allow user to log out

This way, the user doesn't have to closer the browser to log out.