Add travis ci (#35)

* Add travis CI
* Add ci testing of example models (with python 2.7 as py3 still fails)
diff --git a/.gitignore b/.gitignore
index 5503138..162c415 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 /build
 /dist
 /.coverage
+.kitchen