Fix README formatting
Fix README formatting

There were some stray tick marks, and commands were not differentiated
from regular text in the rst file. Commands were made either inline
literals or block literals.

Change-Id: I939d2c24167ff4070213980de7c7c54fc5cfbf4b

stackforge/refstack-client,stackforge/refstack-client,openstack/refstack-client,openstack/refstack-client