Adding a basic "what is crane?" section to the README

This is not comprehensive or perfect, but a lot better than nothing.
Automatic commit of package [python-crane] release [0.2.2-0.1.beta].
Do not run unit tests during RPM build

The unit tests depend on external network connectivity to pull down some test
packages outside of RPM deps. This is not allowed in Koji.

The tests run via Travis anyway so this second run is not needed.
Automatic commit of package [python-crane] release [0.2.2-0.2.beta].
review improvements
openshift poc