Update top level pom with bookshelf gke

Shun Fan · Shun Fan · commit 6cd6aabb5ef7 · 2016-07-28T16:38:43.000-07:00
diff --git a/pom.xml b/pom.xml
@@ -38,6 +38,7 @@ limitations under the License.
         <module>bookshelf/4-auth</module>
         <module>bookshelf/5-logging</module>
         <module>bookshelf/6-gce</module>
+        <module>bookshelf/optional-container-engine</module>
         <module>helloworld-jsp</module>
         <module>helloworld-servlet</module>
         <module>helloworld-springboot</module>
