Merging in futures and TCP stream branches

Over the past few days, I’ve been documenting some of the branches of cl-async that I think add a lot of useful functionality. These include the TCP stream implementation (lisp streams on top of cl-async non-blocking sockets) and futures which provide a useful abstraction for asynchronous programming. These branches have now been merged in to the master branch and are ready for use.

The docs are complete, so feel free to give them a try.