[cass] Make sure to enable start_rpc

* also note in titan-gremlin that 1.x of ES is needed
* provide docker compose snippet
Part of #68

titan-gremlin/README.md

@@ -17,11 +17,11 @@ the next time you (re)start your container.
 
 # Connecting to Cassandra and Elasticsearch Containers
 
-First start containers for Cassandra and Elasticsearch, where the `--name` you choose
-can be arbitrary or left off to use a generated name.
+First start containers for Cassandra and Elasticsearch (pre-2.x),
+where the `--name` you choose can be arbitrary or left off to use a generated name.
 
-    docker run -d --name gremlin-cass itzg/cassandra 
-    docker run -d --name gremlin-es itzg/elasticsearch
+    docker run -d --name gremlin-cass itzg/cassandra
+    docker run -d --name gremlin-es itzg/elasticsearch:1.x
 
 Now start Gremlin with networking links to those containers with the aliases
 
@@ -43,3 +43,21 @@ and with that you can follow the
     ==>age=10000
     gremlin> saturn.in('father').in('father').name
     ==>hercules
+
+# Running and Connecting with Docker Compose
+
+Create the following Compose content as the file `docker-compose.yml` and in
+that directory invoke `docker-compose run titan` to run the Gremlin shell
+with the supporting Elasticsearch and Cassandra containers.
+
+```
+titan:
+    image: itzg/titan-gremlin
+    links:
+        - cass
+        - es
+cass:
+    image: itzg/cassandra
+es:
+    image: itzg/elasticsearch:1.x
+```

titan-gremlin/start-gremlin.sh

@@ -48,7 +48,7 @@ END
 index.search.hostname=$esAddr
 END
   fi
-  
+
 fi
 
 if [ -n "$shortcut" ]; then
@@ -59,4 +59,6 @@ END
   args="$args /tmp/init.groovy"
 fi
 
+# Allow a little extra time for Cassandra to be ready
+sleep 1
 exec $TITAN_HOME/bin/gremlin.sh $args