fix postgres quoting in rails 3

already fixed, just need to move it out of the CANVAS_RAILS2 branch.

also, we don't care about quoting of money or binary columns, and the
default quoting of them changed from rails 2 to rails 3, so don't test
them

Change-Id: I26a556020ec672ff2818470b503aa9f0961a98e4
Reviewed-on: https://gerrit.instructure.com/30307
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: James Williams  <jamesw@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>