Created custom signin/signout pages

Created a new layout and view for redirecting users with a message -- identical to default IPB redirect.
Created router pages for signing in and signing out users and offering them helpful messages.
No longer have to worry about auth_key.
Merged ipbwi branch into master

Changes include organizational changes to signin/signout dropdown,
custom signin/signout functionality using ipbwi, a new redirect
layout and view for creating redirect messages (copied from IPB)