Add badges

README.txt

@@ -5,6 +5,18 @@
 GA4GH Reference Implementation
 ==============================
 
+.. image:: https://img.shields.io/pypi/v/ga4gh.svg
+   :target: https://pypi.python.org/pypi/ga4gh/
+   :alt: Current PyPi Release
+
+.. image:: https://readthedocs.org/projects/ga4gh-reference-implementation/badge/?version=latest
+   :target: http://ga4gh-reference-implementation.readthedocs.io/en/latest/?badge=latest
+   :alt: Documentation Status
+
+.. image:: https://badges.gitter.im/Join%20Chat.svg
+   :alt: Join the chat at https://gitter.im/ga4gh/server
+   :target: https://gitter.im/ga4gh/server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+
 .. image:: https://img.shields.io/travis/ga4gh/server/master.svg
    :alt: Current build status on Travis-CI, click for more
    :target: https://travis-ci.org/ga4gh/server
@@ -13,10 +25,6 @@ GA4GH Reference Implementation
    :alt: Current code coverage of master branch, click for details
    :target: https://codecov.io/github/ga4gh/server
 
-.. image:: https://badges.gitter.im/Join%20Chat.svg
-   :alt: Join the chat at https://gitter.im/ga4gh/server
-   :target: https://gitter.im/ga4gh/server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
-
 This is the development version of the GA4GH reference implementation.
 If you would like to install the stable version of the server, please
 see the instructions on `the PyPI page <https://pypi.python.org/pypi/ga4gh>`_.