Identity v3 Projects List (#163)

* Identity v3 Projects List

* Rename ToListQuery to ToProjectListQuery
diff --git a/openstack/identity/v3/projects/urls.go b/openstack/identity/v3/projects/urls.go
new file mode 100644
index 0000000..e80a395
--- /dev/null
+++ b/openstack/identity/v3/projects/urls.go
@@ -0,0 +1,7 @@
+package projects
+
+import "github.com/gophercloud/gophercloud"
+
+func listURL(client *gophercloud.ServiceClient) string {
+	return client.ServiceURL("projects")
+}