Merge pull request #539 from edx/sarina/upgrade-travis

Upgrade Travis to use new container infrastructure

.travis.yml

@@ -1,15 +1,23 @@
+sudo: false
 language: python
+python:
+  - "2.7"
+cache:
+    directories:
+        - $HOME/.cache/pip
+install:
+    - "pip install -r shared/travis_requirements.txt"
+script: "./run_tests.sh"
 branches:
     only:
         - master
-python: "2.7"
+
+
+
 # This part isn't needed until we are running latexpdf builds.
 # before_install:
-    # MacTex is used locally (MacOSX) by the docs team,
-    # but since we are using a linux machine for travis,
-    # we can use texlive-full instead.
-    # - "sudo apt-get update"
-    # - "sudo apt-get install texlive-full git python-dev -y"
-install:
-    - "pip install -r shared/travis_requirements.txt"
-script: "./run_tests.sh"
+#     MacTex is used locally (MacOSX) by the docs team,
+#     but since we are using a linux machine for travis,
+#     we can use texlive-full instead.
+#     - "sudo apt-get update"
+#     - "sudo apt-get install texlive-full git python-dev -y"