Revised readme to reflect project changes.

We now focus more on the data transport feature rather than on being able to
daemonize in a beginner-friendly way.
Revised the sample code in README to reflect the changes in package structure.
Reinstating gevent, removing unneeded libs in requirements.txt.
Introducing v0.2.0, the first exclusively using gevent, without python-daemon.
Added out and redis db files to .gitignore .