fixed readme for bb

README.rst

@@ -112,3 +112,13 b' Online documentation'
 
    make html
 
+.. _virtualenv: http://pypi.python.org/pypi/virtualenv
+.. _python: http://www.python.org/
+.. _django: http://www.djangoproject.com/
+.. _mercurial: http://mercurial.selenic.com/
+.. _subversion: http://subversion.tigris.org/
+.. _git: http://git-scm.com/
+.. _celery: http://celeryproject.org/
+.. _Sphinx: http://sphinx.pocoo.org/
+.. _GPL: http://www.gnu.org/licenses/gpl.html
+.. _vcs: http://pypi.python.org/pypi/vcs
  No newline at end of file