not_equal_to option in NumericalityValidator

Test fails on Ruby 1.8.7 since Ruby 1.8.7 does not define != as a method. Works fine in 1.9.2 since it does. We need to postpone applying this patch until we only support 1.9.2 forward.

This issue has been automatically marked as stale because it has not been commented on for at least three months.

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