[Travis] Test to run travis on both Xenial and Trusty

.travis.yml

@@ -2,16 +2,25 @@ sudo: false
 language: python
 python:
   - "2.7"
-# command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
+
+os: linux
+
+addons:
+  postgresql: "9.3"
+
+before_install:
+  - export BOTO_CONFIG=/dev/null
+
 install:
   - pip install --upgrade pip
   - pip install -r requirements.txt
-# command to run tests, e.g. python setup.py test
-script: "python -Wall manage.py test"
-addons:
-  postgresql: "9.3"
+
 before_script:
   - psql -c 'create database helios;' -U postgres
-before_install:
-  - export BOTO_CONFIG=/dev/null
 
+script: "python -Wall manage.py test"
+
+jobs:
+  include:
+  - dist: trusty
+  - dist: xenial
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