Adding support for the 'members' command.
Making SerfClient objects available at the scope level of the serfclient module, so users don't have to do 'from serfclient.client import SerfClient'
Simplifying use of msgpack.Unpacker and removing BytesIO
python3 compatible import
Removing SerfClient import from __init__
Removing blank line.
Fixing member list test for py3, can't use unicode strings as dict keys for serf agent responses.
Merge pull request #3 from derpston/master

Add support for the 'members' command, other small fixes