GSoC: finagle-smtp - initial

This is initial version of SMTP client for Finagle, which I am working on during GSoC'14.
For now it supports sending independent commands to SMTP server and sending a simple text email to one ore more addresses (without cc, bcc and reply-to). Usage is described in `README.md`. 
Wait, I thought you were saying that it wasn't behaving properly in the dispatcher?  I think I got confused as to what was going on . . . I was trying to reply to a message you posted that said, 

>Yes, when testing with SMTP server stub and looking at its logs, I found out that this request is not actually sent from dispatcher, so I sought the way to enforce service(Request.Quit) before service.close(deadline)

but I couldn't find the actual message (github swallowed it maybe) so I just put it here.

Is the behavior correct now then?