Merge pull request #14 from pganssle/travis-docs

Add documentation build to travis

Author: pganssle

.travis.yml

@@ -8,6 +8,12 @@ python:
   - 3.3
   - 2.7
 
+matrix:
+  fast_finish: true
+  include:
+    - python: 3.6
+      env: TOXENV=docs
+
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install: pip install -U tox-travis