ci: install test deps from setup.py

Includes special handling for the circleci/python:3.4 image, which
doesn't setup PATH properly. This isn't worth fixing right now, as it is
likely that we'll deprecate Python 3.4 support very soon.

.circleci/config.yml

@@ -49,8 +49,7 @@ jobs:
       - image: circleci/python:2.7
     steps:
       - checkout
-      - run: pip install --user .
-      - run: sudo pip install coverage pylint==1.9.3 flake8 mock==3.0.5
+      - run: pip install --user .[test]
       - run:
           name: Linting with Flake8
           command: |
@@ -59,9 +58,22 @@ jobs:
       - run: make e2e_test
 
   test_34:
-    <<: *test
     docker:
       - image: circleci/python:3.4
+    steps:
+      - checkout
+      - run: pip install --user .[test]
+
+      # The circleci/python:3.4 image doesn't set PATH correctly, so we need to
+      # install these by hand with sudo
+      - run: sudo pip install coverage pylint==1.9.3 flake8 mock==3.0.5
+
+      - run:
+          name: Linting with Flake8
+          command: |
+            git diff origin/master..HEAD analytics | flake8 --diff --max-complexity=10 analytics
+      - run: make test
+      - run: make e2e_test
 
   test_35:
     <<: *test