Increased latest version to 3.0.4b0 [skip ci]

README.rst

 .. vim: set fileencoding=utf-8 :
 .. Thu 11 Aug 15:13:11 CEST 2016
 
-.. image:: http://img.shields.io/badge/docs-v3.0.3-yellow.svg
-   :target: https://www.idiap.ch/software/bob/docs/bob/bob.io.base/v3.0.3/index.html
+.. image:: http://img.shields.io/badge/docs-stable-yellow.svg
+   :target: https://www.idiap.ch/software/bob/docs/bob/bob.io.base/stable/index.html
 .. image:: http://img.shields.io/badge/docs-latest-orange.svg
    :target: https://www.idiap.ch/software/bob/docs/bob/bob.io.base/master/index.html
-.. image:: https://gitlab.idiap.ch/bob/bob.io.base/badges/v3.0.3/build.svg
-   :target: https://gitlab.idiap.ch/bob/bob.io.base/commits/v3.0.3
-.. image:: https://gitlab.idiap.ch/bob/bob.io.base/badges/v3.0.3/coverage.svg
-   :target: https://gitlab.idiap.ch/bob/bob.io.base/commits/v3.0.3
+.. image:: https://gitlab.idiap.ch/bob/bob.io.base/badges/master/build.svg
+   :target: https://gitlab.idiap.ch/bob/bob.io.base/commits/master
+.. image:: https://gitlab.idiap.ch/bob/bob.io.base/badges/master/coverage.svg
+   :target: https://gitlab.idiap.ch/bob/bob.io.base/commits/master
 .. image:: https://img.shields.io/badge/gitlab-project-0000c0.svg
    :target: https://gitlab.idiap.ch/bob/bob.io.base
 .. image:: http://img.shields.io/pypi/v/bob.io.base.svg

version.txt

-3.0.3
+3.0.4b0
\ No newline at end of file