Give travis-ci a break

ruby 1.9.2 will be EOL next month (June 2014)
and Rails 2.3 is EOL since a while now.

Currently a single commit trigger (4 * 5) - 2 = 38 travis builds
With this change 3 * 4 = 12 builds
Merge pull request #1226 from Shopify/give-travis-a-break

Give travis-ci a break
Authorize.Net CIM: Do not send x_test_request

Closes #1227.
Authorize.Net CIM: Pass delimiter through

Closes #1093.
HPS: Add support for track data

Closes #1225.
HPS: Fix processing without an address

Closes #1229.
Balanced: Do not pass address if zip is blank

Closes #1231.
Remove dependency on active_utils Validateable

The goal of this change is to begin breaking the dependency on
active_utils and, in turn, ActiveSupport. We're now doing super simple
validation in ActiveMerchant models, and there's a separate require to
add Rails integration.

For now, using Rails-specific methods without explicitly requiring the
integration will simply generate a deprecation warning. In
ActiveMerchant 2.x the methods will have to be explicitly required.