faster better stronger

Travis build environment was updated to FF 31

https://www.loomio.org/discussions/10519?proposal=6611

This reverts commit ecf77b6a.

disable postgres for now;  there is a problem with travis' postgres, and they are planning to upgrade to postgres9 tomorrow, so we can re-enable it ASAP after that gets sorted

Add production group back in and move what we can in there so that travis gem installs don't take as long

we cause too much load on travis: if you have a fork and use travis please turn it off; run oauth-cucumber inside other build to reduce builds and save (setup) time.