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/extensions/reclass-config.yml b/test/model/extensions/reclass-config.yml
new file mode 100644
index 0000000..6e2f101
--- /dev/null
+++ b/test/model/extensions/reclass-config.yml
@@ -0,0 +1,3 @@
+storage_type: yaml_fs
+ignore_class_notfound: True
+ignore_class_regexp: ['.*']