Add Travis configuration for GitHub

Change-Id: Ic4809bdd4fcb2e9de5d3281f659897a90cf8c2b7

.travis.yml

@@ -0,0 +1,17 @@
+language: python
+dist: xenial
+sudo: required
+cache:
+  - pip
+python:
+    - 2.7
+    - 3.5
+    - 3.6
+before_install:
+  # Always redownload tarball
+  - find ~/.cache/pip -name '*.dev*' -delete
+  - sudo apt-get -qq update
+install:
+    # The install requirements in travis virtualenv that will be cached
+  - pip install tox-travis .[test]
+script: tox

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py35,py27,pypy,pep8
+envlist = py35,py36,py27,pypy,pep8,docs
 skipsdist = True
 
 [testenv]
@@ -48,3 +48,6 @@ commands = pifpaf --debug run gnocchi -- oslo_debug_helper {posargs}
 show-source = True
 ignore =
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+
+[travis]
+python = 3.6: py36, pep8, docs