Added method to start server loop-back adapter
tests and StartOnLoopbackOnly method overloads
Created new Configuration class to avoid SimpleSmtpServer.Start overloads.
Merge remote-tracking branch 'mindriven/master'
New Configuration class is used.
Conflicts:
	netDumbster.Test/Tests.cs
	netDumbster/SimpleSmtpServer.cs
Fixed classes using the new Configuration API.