Merge pull request #2 from edx/benp/jun2015-travis

Use docker for travis builds.

.travis.yml

@@ -8,6 +8,9 @@ before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
 
+# Set Travis builds to use docker container
+sudo: false
+
 install:
     - "pip install -r requirements.txt"
     - "pip install -r test_requirements.txt"