notification interface introduced + called when needed
smtp mail sending implemented, not working with erni smtp server because of authentication yet
configurable mail server
added also setting for application url address
Merge branch 'master' into mails

Conflicts:
	FootballLeague.Tests/Controllers/MatchesControllerTest.cs
	FootballLeague/Controllers/MatchesController.cs
fixed test
formatting dates/times on two digits from client