Allow override of util.unicodify default encoding with GALAXY_DEFAULT_ENCODING.
See mailing list for more information : http://dev.list.galaxyproject.org/error-with-unicode-output-tp4662783.html. It would be more correct to add a database_encoding option to universe_wsgi.ini, but that would be more work and the even correcter approach is for deployers to configure their databases to store UTF-8 data.