Adding fog-profitbricks as a runtime_dependency.
implements the public_url feature for openstack storage
[AWS|Signature] make signature v4 components easy to extract
[AWS|S3] Vhost buckets don't work if bucket name has a . in it

the S3 wildcard cert is only valid for *.s3.amazonaws.com, not
foo.*.amazonaws.com
[AWS|S3] switch to signature v4
Moving Rackspace support to fog-rackspace