Be sure to install ansible

Enable the mongodb travis service too

.travis.yml

@@ -25,3 +25,7 @@ cache:
     directories:
         - node_modules
         - .tox
+services:
+    - mongodb
+    # Enable when we stop using sqlite for API tests
+    # - postgresql

tox.ini

@@ -41,6 +41,7 @@ commands =
 deps =
     -r{toxinidir}/requirements/requirements.txt
     -r{toxinidir}/requirements/requirements_dev.txt
+    ansible
     coverage
     coveralls
 commands =