Corrected path error in the integration spec.
Added sales controller spec and implementation for all 3 actions required
 Added sale model spec and implementation for all methods used by the controller even though some of these are testing the basics of active record.  It is appopriate to ensure that what I am assuming of the model in the controller tests do actually hold true.
 Added routes to controller (no routing specs added as the integration specs are covering this)
 Tests are not passing at this point, and normally I would not have committed this unless working on a feature branch.  This commit is purely to enable you to see how I am working