[rackspace|databases] Register Rackspace Cloud Databases service with Fog.

lib/fog/bin/rackspace.rb

@@ -15,6 +15,8 @@ class Rackspace < Fog::Bin
         Fog::DNS::Rackspace
       when :identity
         Fog::Rackspace::Identity
+      when :databases
+        Fog::Rackspace::Databases
       else
         raise ArgumentError, "Unrecognized service: #{key}"
       end

lib/fog/rackspace.rb

@@ -48,6 +48,7 @@ module Fog
     service(:storage,         'rackspace/storage',        'Storage')
     service(:load_balancers,  'rackspace/load_balancers', 'LoadBalancers')
     service(:identity,        'rackspace/identity',       'Identity')
+    service(:databases,       'rackspace/databases',      'Databases')
 
     def self.authenticate(options, connection_options = {})
       rackspace_auth_url = options[:rackspace_auth_url] || "auth.api.rackspacecloud.com"