Add display_name field to employee CRUD view.

tailbone/views/employees.py

@@ -150,6 +150,7 @@ class EmployeeCrud(CrudView):
                 fs.id.label("ID"),
                 fs.first_name,
                 fs.last_name,
+                fs.display_name,
                 fs.phone.label("Phone Number").readonly(),
                 fs.email.label("Email Address").readonly(),
                 fs.status.with_renderer(EnumFieldRenderer(EMPLOYEE_STATUS)),