Switched to custom bootstrap

Switched to a customized version of bootstrap that uses a custom brand
color. The custom brand color in this case is Temple University's cherry
red.
Login page displays username and password fields

Added a panel to the login page that displays username and password
fields. There is also a 'Forgot password' link within the same panel that
will open 'accounts.temple.edu' in a new tab.
Login page logo

The login page now has a Temple University logo.
Login role chooser

When a user logs into the system, they can be presented with a role
picker to choose what role they want to login under.
Closes #3.