Explicitly update git submodules

wercker.yml

@@ -1,9 +1,14 @@
 box: debian
 build:
   steps:
+    - install-packages:
+        packages: git ssh-client
+    - script:
+        code: |
+          cd ..
+          git submodule update --init --recursive
     - arjen/hugo-build:
         version: '0.16'
-        config: config.yaml
         disable_pygments: true
 deploy:
   steps:
@@ -14,8 +19,6 @@ deploy:
         key-id: $AWS_ACCESS_KEY_ID
         key-secret: $AWS_SECRET_ACCESS_KEY
   testing:
-    - install-packages:
-        packages: git ssh-client
     - script:
         name: configure git
         code: |-