1) Some changes in the Index.cshtml of the Users controller. If there's no users view will show msg "There is no users yet", otherwise it will show users table.

2) UserService - added WarningException
3) Changes in the try{} catch() {} block in the UsersController
1) Added WarningException when trying to Save user in the UserService.cs

2) Edited UsersController according to the previous
Added new integration test (CanNotAddNewUserWithExistingInTheDbEmail).

This test checks is it possible to add a new user with the email, which already exists in the db.
Catching WarningException when trying to save user in the UsersController class
added try{} catch(){} blocks int UsersController

changed GetUser method in UserService class
added FluentAssertions class for demonstration on the skype conference
edit assertion (in the UsersControllerTest.cs) in the CanNotAddNewUserWithExistingInTheDbEmail() method.
Removed incorrect try{} catch(){} blocks in the UsersController.cs

Changed EditUser in UserService.cs
Edited Edit.cshtml view.
Merge branch 'master' of github.com:fomaa/Calendar
some changes while trying to use gumby