Use the ServiceClient to generate URLs.

Add OkCodes to all of the perigee requests.
diff --git a/openstack/storage/v1/containers/urls.go b/openstack/storage/v1/containers/urls.go
new file mode 100644
index 0000000..4084bcc
--- /dev/null
+++ b/openstack/storage/v1/containers/urls.go
@@ -0,0 +1,13 @@
+package containers
+
+import "github.com/rackspace/gophercloud"
+
+// getAccountURL returns the URI used to list Containers.
+func getAccountURL(c *gophercloud.ServiceClient) string {
+	return c.Endpoint
+}
+
+// getContainerURL returns the URI for making Container requests.
+func getContainerURL(c *gophercloud.ServiceClient, container string) string {
+	return c.ServiceURL(container)
+}