A new, empty Rails project (created with `rails new api-demo`).
Tweaked settings in the project to match our team's usual set up:

- Locked the version of Ruby to 2.1.2.
- Changed the testing framework.
- Set up a Vagrantfile and VM provisioning script (for use with Vagrant).
- Updated .gitignore to ignore the files/folders created by Vagrant.
Set up access to the PayTrace API from any Controller class in the app.
Added a cart controller with checkout and pay actions.
Added a full README.md.
Merge branch 'release/1.0'
Fixing master.
Fixes for public heroku demo.
Merge branch 'master' into develop

* master:
  Fixes for public heroku demo.
  Fixing master.
  Added a full README.md.
  Added a cart controller with checkout and pay actions.
  Set up access to the PayTrace API from any Controller class in the app.
  Tweaked settings in the project to match our team's usual set up:
  A new, empty Rails project (created with `rails new api-demo`).