Moved sqlite3 to dev+test environment. Heroku will deal with production db.
Removed sqlite3 from :production.
Added gem 'pg' for :production.
Added gem 'rails12factor' for :production.
Corrected 'rails12factor' to 'rails_12factor'.
Did a bundle install to regenerate Gemfile.lock after adding gems 'pg' and 'rails_12factor' for Heroku.
Added ruby 1.9.3p484 to Gemfile.
Changed to ruby 1.9.3 (removed the p484) in Gemfile and did install bundle --without production.
Added email to sign-up page (had missed that all along).