Fixed problem in TcpAddress.Resolve where textual addresses like "localhost" didn't resolve and added supporting test case
Only use Dns.GetHostEntry if IPAddress.TryParse fails - for performance reasons

http://netrsc.blogspot.de/2008/02/ipaddressparse127001-vs.html
Merge pull request #50 from Artesian/ip-resolve-fix

Can't connect sockets when the endpoint address is not an IP Address