[WIP] Travis errors when using PostgreSQL 8.4

Last known pass (Nov 20 2013 5:15 PM): 
https://travis-ci.org/okfn/ckan/builds/14261294

First known failure (Nov 20 2013 5:37 PM):
https://travis-ci.org/okfn/ckan/builds/14264368


Update: There was a Travis Upgrade on Wednesday 20th November which is most likely related: http://about.travis-ci.org/blog/2013-11-18-upcoming-build-environment-updates/