Move to the new Travis infrastructure.

Author: gsnedders

.travis.yml

@@ -31,6 +31,12 @@ matrix:
     - python: "3.4"
       env: USE_OPTIONAL=false FLAKE=true
 
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.cache/pip
+
 before_install:
   - git submodule update --init --recursive