init commit.
added pry
initial creation of purchases
scaffold-ed out other models
git rmed stuff and gitignore
working feature spec
fixup spelling mistakes
added many constructor tests
a few more constructor tests
feature works
fleshed out feature specs
DRY-ed up feature
cleanup
enforce quantity qualified on expectations
added root path
make attributes rightly
reversed associations.
simplified form
added counter to spec
had to change directions. implemented csv import in  more boring way