Update feedGateway.cfc

Fixing issue with extended data query condition where datatype attribute on addParam functions are not being passed into getCastString. If expecting numericvalue in the query and validation isn't set on the attribute, stringvalue is always used causing considerable performance implications on large tclassextendeddata tables.
Merge pull request #1530 from nsollecito/patch-8

Update feedGateway.cfc
Conditionally usinf sessionInValidate