Set local ruby version.
Create new rails app
Add rspec
Add guard.
Store example_input.tab in fixtures directory.
Set up integration test
Fix deprecation
Create PurchaseDataImport scaffold.
Upload file
Tidy up views.
Add shoulda
Create Customer
Import customers
Add and import Merchants.
Create and import Items.
Create and import Purchases.
Add gross_revenue to purchase.
Implement total_gross_revenue.
Add total gross revenue to index.
Add total_gross_revenue to show.