Implement images.Get(). Image tests now pass.
diff --git a/openstack/compute/v2/images/urls.go b/openstack/compute/v2/images/urls.go
index 0e40a4e..93fa8d2 100644
--- a/openstack/compute/v2/images/urls.go
+++ b/openstack/compute/v2/images/urls.go
@@ -5,3 +5,7 @@
 func getListURL(client *gophercloud.ServiceClient) string {
 	return client.ServiceURL("images", "detail")
 }
+
+func getImageURL(client *gophercloud.ServiceClient, id string) string {
+	return client.ServiceURL("images", id)
+}