Convert to more modern openstack-common.conf format

Change-Id: I60345e0ee7b92ee4f5b179924ff1c4e3186561ed
Improve README, add HACKING.

The HACKING file is taken almost verbatim from marconi.

The README adds many useful resources: links to Wiki, more prominent
version number, link to HACKING guide.

The setup.py's copyright year has been bumped (2010 -> 2013).

Change-Id: I6385c54ca09321d4a7e26f5821b9a4323264891b
Merge "Convert to more modern openstack-common.conf format"
Merge "Improve README, add HACKING."