Added the :if option to all validations that can either use a block or a...
Added the :if option to all validations that can either use a block or a method pointer to determine whether the validation should be run or not. #1324 [Duane Johnson/jhosteny] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1340 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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