Merge pull request #496 from willingc/doc-badge

Add status badges to README

README.md

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 # Jupyter Notebook
 
+[![Google Group](https://img.shields.io/badge/-Google%20Group-lightgrey.svg)](https://groups.google.com/forum/#!forum/jupyter)
+[![Build Status](https://travis-ci.org/jupyter/notebook.svg?branch=master)](https://travis-ci.org/jupyter/notebook)
+[![Documentation Status](https://readthedocs.org/projects/jupyter-notebook/badge/?version=latest)](http://jupyter-notebook.readthedocs.org/en/latest/?badge=latest)
+
 The Jupyter HTML notebook is a web-based notebook environment for interactive computing.
 
 Dev quickstart: