Add function to User model to find all primary, secondary and tertiary connections.
Refactor connections finding methods in User model.
Add method to collect all connections, memoizing the hashes for the connection degrees to minimize sql queries.
Add default_scope to Post model and revise posts_of_connections/by category methods in User model.
Fix styling on sigin/up views and change devise routing.
Remove cruft from application.rb related to devise routing; style application layout view.