Removing assignment/exam/event indicators.

They turn out to both cause problems and not really be that helpful. We
could add them back in later in a more compact way.
Change the class period indicator badge to a label.

It's more fun this way.
Move things around in the panel headers.
Add the current user's email to the navbar.

This may need to be removed later on as we add more stuff, but I like
having more information.