Add travis ci (#35)

* Add travis CI
* Add ci testing of example models (with python 2.7 as py3 still fails)
diff --git a/test/model/default/reclass-config.yml b/test/model/default/reclass-config.yml
new file mode 100644
index 0000000..9d8f30f
--- /dev/null
+++ b/test/model/default/reclass-config.yml
@@ -0,0 +1 @@
+storage_type: yaml_fs