Include queuable extra in docker image, and use more recent datalake

Previously we were pinned to an older version

Author: oldpatricka

Dockerfile

@@ -29,7 +29,7 @@ RUN pip install \
     pyinotify>=0.9.4, \
     raven>=5.0.0 \
     'tox>4,<5' \
-    'datalake<2'
+    'datalake[queuable]>2'
 
 RUN mkdir -p /opt/
 COPY . /opt/