Removing TestConnection, Starting fixes for AsyncServiceClient

Fixes #13 .  This totally removes the crappy TestConnection I wrote a while ago that uses blocking sockets, and now just uses an AsyncServiceClient.  Some tests are still ignored because of #19 , and the test referenced in #4 just needs to be redone.
I meant, why do we not have a "stash()" call in this state?  Sorry, I wasn't very clear, it was a bit late when I was writing :)