Basic readme file.
async_sock: Removed socket to thread dependency

Prior major flaw, which used a single thread for each socket to poll for
socket events was removed. Essentially this implements a full loop,
which is integrated into asyncio loop. Main difference - a single thread
is used by async_zmq to poll for all sockets that could be created with
SocketFactory.
examples: Added examples to demonstrate usage

Added a generic script to invoke example scripts, with 2 examples
created: publisher and subscriber. Running:

        `./run_example.py -p publisher`

Would start the publisher. You can start subscriber on a different
terminal to receive published messages.
clean_up: Removing initial tests, and unnecessary files.
Merge branch 'scalable_sockets'