refactor(CustomerService.query): no need to send the scope to the service
refactor(CustomerList): use controller alias instead of $scope
refactor(CustomerList): eliminating use of $scope
refactor(CustomerList): remove use of $scope in controller
  - Data changes when creating and editing is now controlled in the modal window (not in the service)
  - After removing the current page will be reloaded from controller
  - Remove unnecessary code and comment from the test spec
refactor(CustomerModalForm): move  modal form logic to a new service