Add devise, omniauth, paper_trail gems to begin AAA.
Import Devise login pages. Port the Sign In page to HAML.
Rewrite the Devise erb as haml.
Let there be Google OAuth2
Add OmniAuth callbacks to lookup / create accounts on the fly.
Move the changelog link to the bottom copyright block.
Default to auth disabled.
Fix global nav in light of auth_enabled flag.
Time for paper_trail.
Add auth_allow_registration
Begin marking models for paper_trail.
Add bcrypt-ruby to the Gemfile