created skeleton, sales engine, and started db
finished db, wrote skeletons of classes, created fixtures
set basic class attr readers, inits, and requires
added spec files
setup basic integration tests
setup unit tests
fixed paths in requires of unit tests
got basic unit tests functional with existence test and params
all have existence tests:
added basic obj tests for obj return class
added tests for setting up attrs on bsaic objects
built repo tests
added populate list and attrs to repo classes
fixed dataflow in sales_engine and database
removed unnecccary ref to sales_engine in db.rb
implemented all method on repos
implemented random method on repos
added find by id, find by invoice id, and find all by invoice id for invoice item repo
added findallbyid to inv item repo
added find and find all by item id to iir