generated models for store, transaction, transactionItems, and Item
added default value of 1 to transaction item's quantity field and fixed error in generated transcationItem model
generated transactions controller and added some (non-working) code to start having a show transaction method. also added customer_id to the Transaction model
starting to write populator script
moved populate script to lib subdirectory
wrote first version of populate script. still neeed to test it
fixed errors in transactionItem migration
populate script works. also added Hirb gem to gemfile for prettier console output while developing