Add binder badge to readme (#2758)

* Add binder badge to readme

* Use rst instead of .md

* Use proper rst

* Add full requirements to binder

* Add master pymc3

* Add more dev requirements to be able to run notebooks

* Unpin IPython to allow python2.7 builds

* Add bokeh to requirements

* Move badge to top

README.rst

@@ -3,15 +3,16 @@
     :alt: PyMC3 logo
     :align: center
 
-|Build Status| |Coverage| |NumFOCUS_badge|
+|Build Status| |Coverage| |NumFOCUS_badge| |Binder|
 
 PyMC3 is a Python package for Bayesian statistical modeling and Probabilistic Machine Learning
 which focuses on advanced Markov chain Monte Carlo and variational fitting
 algorithms. Its flexibility and extensibility make it applicable to a
 large suite of problems.
 
-Check out the `getting started guide <http://docs.pymc.io/notebooks/getting_started>`__!
-
+Check out the `getting started guide <http://docs.pymc.io/notebooks/getting_started>`__,  or 
+`interact with live examples <https://mybinder.org/v2/gh/pymc-devs/pymc3/master?filepath=%2Fdocs%2Fsource%2Fnotebooks>`__
+using Binder!
 
 Features
 ========
@@ -176,6 +177,8 @@ Sponsors
 
 |Quantopian|
 
+.. |Binder| image:: https://mybinder.org/badge.svg 
+   :target: https://mybinder.org/v2/gh/pymc-devs/pymc3/master?filepath=%2Fdocs%2Fsource%2Fnotebooks
 .. |Build Status| image:: https://travis-ci.org/pymc-devs/pymc3.png?branch=master
    :target: https://travis-ci.org/pymc-devs/pymc3
 .. |Coverage| image:: https://coveralls.io/repos/github/pymc-devs/pymc3/badge.svg?branch=master

binder/requirements.txt

@@ -0,0 +1,4 @@
+-r ../requirements-dev.txt
+# this installs pymc3 itself. it is funny that this is an absolute path, 
+# but reqirements-dev.txt is relative.
+.

requirements-dev.txt

@@ -1,5 +1,8 @@
+bokeh>=0.12.13
 CommonMark==0.5.4
 h5py>=2.7.0
+ipython
+Keras>=2.0.8
 matplotlib>=1.5.0
 mock>=2.0.0; python_version < '3.4'
 nbsphinx>=0.2.13
@@ -13,5 +16,6 @@ pytest-cov>=2.5.1
 pytest>=3.0.7
 recommonmark>=0.4.0
 scipy>=0.12.0
+seaborn>=0.8.1
 sphinx-autobuild==0.7.1
 sphinx>=1.5.5