Increased latest version to 3.1.1b0 [skip ci]

README.rst

 .. vim: set fileencoding=utf-8 :
 .. Sun Aug 21 21:38:15 CEST 2016
 
-.. image:: http://img.shields.io/badge/docs-v3.1.0-yellow.svg
-   :target: https://www.idiap.ch/software/bob/docs/bob/bob.bio.gmm/v3.1.0/index.html
+.. image:: http://img.shields.io/badge/docs-stable-yellow.svg
+   :target: https://www.idiap.ch/software/bob/docs/bob/bob.bio.gmm/stable/index.html
 .. image:: http://img.shields.io/badge/docs-latest-orange.svg
    :target: https://www.idiap.ch/software/bob/docs/bob/bob.bio.gmm/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob.bio.gmm/badges/v3.1.0/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob.bio.gmm/commits/v3.1.0
-.. image:: https://gitlab.idiap.ch/bob/bob.bio.gmm/badges/v3.1.0/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob.bio.gmm/commits/v3.1.0
+.. image:: https://gitlab.idiap.ch/bob/bob.bio.gmm/badges/master/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob.bio.gmm/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob.bio.gmm/badges/master/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob.bio.gmm/commits/master
 .. image:: https://img.shields.io/badge/gitlab-project-0000c0.svg
    :target: https://gitlab.idiap.ch/bob/bob.bio.gmm
 .. image:: http://img.shields.io/pypi/v/bob.bio.gmm.svg

version.txt

-3.1.0
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+3.1.1b0
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