Bump Ruby to 2.1.5
Remove unnecessary lines from database.ml

- don’t reference Heroku: I’m on Ninefold now
- defer to default username and host
Insert spring binstubs (and use them with guard)

This is so that the rails, rake, and rspec commands use spring
Bump Rails to RC3
Remove memcachier (Heroku-only) from gemfile

And add some more comments
Ignore development-specific Procfile.dev
Remove minutest gem and move factory_girl into test
Turbolinks!

Also removes page-specific JS, which was used only for lazy loading images, which we can DRY out by calling on every page load