setting up CI

.travis.yml

@@ -0,0 +1,8 @@
+language: python
+python:
+  - "3.6"
+cache: pip
+install:
+  - pip install -r requirements.txt
+script:
+  - python tests.py

test.py

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+import subprocess
+import tempfile
+
+
+def _exec_notebook(path):
+    with tempfile.NamedTemporaryFile(suffix=".ipynb") as fout:
+        print(fout.name)
+        args = ["jupyter", "nbconvert", "--to", "notebook", "--execute",
+                "--ExecutePreprocessor.timeout=1000",
+                "--output", fout.name, path]
+        subprocess.check_call(args)
+
+
+def test():
+    _exec_notebook('./example1/0-Workflow.ipynb')