[openstack|storage] intial import

Porting Fog Rackspace Storage service to OpenStack.
Mostly replaced names, removed CDN stuff (perhaps Rackspace specific)
and used authenticate_v2 (keystone).
[openstack|storage] added OpenStack Storage to lib/fog/storage.rb
[openstack|storage] Added OpenStack.escape utility method

Required by OpenStack Storage service.
[openstack|storage] Added storage service to lib/fog/bin/openstack.rb
[openstack|storage] Added OpenStack Storage service tests

Mostly copy&paste from the Rackspace Storage service
[openstack|storage] configurable service_type and service_name

- openstack_service_type defaults to object_storage
- openstack_service_name defaults to nil

refs #1496
[openstack|storage] added openstack_tenant and openstack_region params

Added openstack_tenant and openstack_region as recognized parameters
and pass them to OpenStack.authenticate_v2.
Merge pull request #1496 from rubiojr/openstack-storage

OpenStack Storage Service