Updating dockerfiles to allow for previewing of latest master and fixing local docker build so it works on osx

docker/local/Dockerrun.aws.json

@@ -0,0 +1,13 @@
+{
+  "AWSEBDockerrunVersion": "1",
+  "Image": {
+    "Name": "YOUR_DEV_INSTANCE_HERE",
+    "Update": "true"
+  },
+  "Ports": [
+    {
+      "ContainerPort": "80"
+    }
+  ],
+  "Logging": "/var/log/"
+}