Use Spree 2.4.beta for master.
Remove external service to avoid branch issues.
Dry specs using global require spec_helper.
Use documentation style for RSpec.
Require sass for layout.
Update dependencies and specs for Rspec 3.
Update simplecov dependency.
Use nested module/class definitions.
Add Rubocop and Reek config files.
Ruby style tweaks.
Need to explicit define lib path for migrations.