Increase version number

doc/conf.py

@@ -49,9 +49,9 @@ copyright = ('2008-2011, Bertrand Chenal, Cédric Krier, Ian Wilson, '
 # built documents.
 #
 # The short X.Y version.
-version = '5.0'
+version = '5.1'
 # The full version, including alpha/beta/rc tags.
-release = '5.0'
+release = '5.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.