Add Python 2.7 (py27) to Travis

Author: stephendonner

.travis.yml

@@ -1,23 +1,22 @@
 sudo: required
+language: python
+services:
+  - docker
 jobs:
   include:
     - stage:
-      language: python
-      services:
-        docker
       env:
         - TOXENV=flake8
-      before_install: docker build -t axe-selenium-python .
-      install: skip
-      script:
-        - docker run -e TOXENV=$TOXENV axe-selenium-python tox
     - stage:
-      language: python
-      services:
-        docker
+      env: TOXENV=py27
+    - stage:
       env:
         - TOXENV=py36
-      before_install: docker build -t axe-selenium-python .
-      install: skip
-      script:
-        - docker run -e TOXENV=$TOXENV axe-selenium-python tox
+cache:
+  pip: true
+before_install: docker build -t axe-selenium-python .
+install: skip
+script:
+    - docker run -e TOXENV=$TOXENV axe-selenium-python tox
+notifications:
+  email: fte-ci@mozilla.com