Update README, update Worker class for Einhorn v0.4 (fixes #1)
Removed the call to recv() in Client::command().
Added docs about sending commands manually.
Added docs about the client() method's arguments.
Make code block syntax highlighted.
Removed unused class, fixed typo, added more docs.
Exiting if script was called without file descriptor.
Renamed open() to socket(), fixed env variable for unix socket to mas…
…ter, added example.