add Travis.yml

travis.yml

 language: python
 python:
+  - "2.7"
   - "3.6"
-# command to install dependencies
+
+notifications:
+  email: false
+
 install:
-  - python setup.py install .
+    - pip install -q cython numpy networkx scipy scikit-learn pandas
+    - python setup.py install
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