added User, Account, Location, Gateway, and Sensor containers for display
Improved Sensor table attributes & relationships
Created Definition container for display, fixed others after most recent database change
Finished ViewModel containers, including Definition & UserTank objects
added provisioning logic to definition models
Added new Account & User tests, cleaned up test project
Finished unit tests for Account, User, & Location objects/containers
Added unit tests for Gateways
Finished unit tests for Tanks