Homepage

Users can create an account, login, and signup with sessions being created and destroyed appropriately. 

Static homepage displays login and signup forms when there is no current user, or plain text for logged in users (to be changed later).

Created different menus for logged in and logged out users.

Created necessary filler pages for routes to function.

Updated ```User``` and ```Session``` controllers to handle all of the magic.

Basic CSS tweaks to make for a more uniform UI.