Fix failing Travis CI build

Created by: lwm

It's a weird error, so I'll need to play around to find out why it's failing.

It appears there are two issues:

1. A failling package install due to missing version
2. Installing a new postgres (well, old, 9.1) conflicts with an existing postgres 9.2

TODO:

• Bump PGVERSION up to 9.3 (match Map Action version)
• Get postgres to successfully start (after version setup)

Closes #3 (closed).