minor changes in the tests
added new extension method to validate email addresses
removed extension method to validate email addresses and added this method to EmailSender.cs
added overloaded method LoadUsersByBirthday(DateTime from), added integration test (UsersRulesTest.cs), changed HomeService.cs, added NBuilder to generate test data
minor changes
Merge branch 'master' of github.com:fomaa/Calendar

Conflicts:
	Bs.Calendar.Mvc/Services/UserService.cs
removed IsValidEmailAddress from AccountService.cs