fixing date bug that was preventing requests.

Date.new does not return today's date and Foursquare apparently starting enforcing versions as of last night. Simply changing to Date.today resolves the errors.

[foursquare] {"meta"=>{"code"=>410, "errorType"=>"param_error", "errorDetail"=>"The Foursquare API no longer supports requests that pass in a version v <= 20120609. For more details see https://developer.foursquare.com/overview/versioning"}, "response"=>{}}