Add gitter and slack channels

Author: KirstieJane

README.rst

@@ -90,6 +90,10 @@ To participate in the Nipype development related discussions please use the foll
 
 Please add *[nipype]* to the subject line when posting on the mailing list.
 
+You can even hangout with the Nipype developers in their 
+`Gitter <https://gitter.im/nipy/nipype>`_ channel or in the BrainHack `Slack <https://brainhack.slack.com/messages/C1FR76RAL>`_ channel. (Click `here <https://brainhack-slack-invite.herokuapp.com>`_ to join the Slack workspace.)
+
+
 Contributing to the project
 ---------------------------
 

doc/_templates/indexsidebar.html

@@ -5,9 +5,10 @@ <h3>{{ _('Links') }}</h3>
     <li>Docs: <a href="http://nipy.org/nipype">Stable</a> · <a href="http://nipype.readthedocs.org/en/latest/">Dev</a></li>
     <li>Code: <a href="http://github.com/nipy/nipype">Github</a> · <a href="http://github.com/nipy/nipype/issues">Bugs-Requests</a></li>
     <li>Forum: <a href="https://neurostars.org/search?q=nipype">User</a> · <a href="https://mail.python.org/mailman/listinfo/neuroimaging">Developer</a></li>
+    <li>Chat: <a href="https://gitter.im/nipy/nipype">Gitter</a> · <a href="https://brainhack.slack.com/messages/C1FR76RAL">Slack</a></li>
     <li><a href="about.html#funding">Funding</a> · <a href="http://nipy.org/software/license/index.html"><img src="https://img.shields.io/pypi/l/nipype.svg" alt="License"></a></li>
     <li><a href="https://travis-ci.org/nipy/nipype"><img src="https://travis-ci.org/nipy/nipype.png?branch=master" alt="travis"></a> · <a href='https://codecov.io/gh/nipy/nipype'><img src='https://codecov.io/gh/nipy/nipype/branch/master/graph/badge.svg' alt='Coverage Status' /></a></li>
     <a href='https://pypi.python.org/pypi/nipype/'><img src='https://img.shields.io/pypi/pyversions/nipype.svg' alt='Python Versions' /></a></li>
 </ul>
 
-{% endblock %}
+{% endblock %} 

doc/devel/interface_specs.rst

@@ -12,6 +12,10 @@ In case of trouble, we encourage you to post on `NeuroStars <https://neurostars.
 NeuroStars.org is a platform similar to StackOverflow but dedicated to neuroinformatics.
 You can also post on the nipype developers mailing list: http://mail.python.org/mailman/listinfo/neuroimaging.
 As we are sharing a mailing list with the nipy community, please add ``[nipype]`` to the message title.
+Alternatively, you're welcome to chat with us in the Nipype 
+`Gitter <https://gitter.im/nipy/nipype>`_ channel or in the 
+BrainHack `Slack <https://brainhack.slack.com/messages/C1FR76RAL>`_ channel.
+(Click `here <https://brainhack-slack-invite.herokuapp.com>`_ to join the Slack workspace.)
 
 
 Overview