High level API for Socket Client

[ghostdogpr]

This is an example of what I was suggesting in #42 : a simpler wrapper on top of our NIO wrapper to expose features in an easy way for users of the library.

I took the example of the socket client, which can be simply used like this:

SocketClient(address).use { client =>
  for {
  _        <- client.write(Array(0, 1, 2))
  received <- client.read(3)
  } yield received
}

What do you think about offering something like that?

[jdegoes]

@ghostdogpr This is conflicting. I love the idea, I think we should use Managed to make things simpler. However, I will close this until conflicts are resolved.