Add badges to README

README.rst

@@ -1,5 +1,5 @@
-Girder Worker |build-status|
-============================
+Girder Worker |build-status| |docs-status| |license-badge| |gitter-badge|
+=========================================================================
 
 A flexible, simple script execution engine that integrates with the
 `Girder <http://girder.readthedocs.org>`_ data management system to run
@@ -14,3 +14,15 @@ Visit the `documentation <http://girder-worker.readthedocs.org>`_ for more detai
 .. |build-status| image:: https://travis-ci.org/girder/girder_worker.png?branch=master
     :target: https://travis-ci.org/girder/girder_worker
     :alt: Build Status
+
+.. |docs-status| image:: https://readthedocs.org/projects/girder-worker/badge?version=latest
+    :target: https://girder-worker.readthedocs.io
+    :alt: Documentation Status
+
+.. |license-badge| image:: docs/license.png
+    :target: https://pypi.python.org/pypi/girder_worker
+    :alt: License
+
+.. |gitter-badge| image:: https://badges.gitter.im/Join Chat.svg
+    :target: https://gitter.im/girder/girder_worker?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+    :alt: Gitter Chat