Added region as an option for file-syncer

Before this it would default to the first region given from the
libcloud service catalog. If we pass a region to the driver then
it will use that region
Graceful fallback for non-rackspace / swift providers

Only try to add the region if the provider allows for it from
the given PROVIDER_TO_REGION mapping
Explicit None when grabbing the forced region
Merge pull request #8 from racker/add_region_as_an_option

Added region as an option for file-syncer