fix challenge naming scheme

server/utils/index.js

@@ -19,17 +19,6 @@ var allNonprofitNames,
   challengeMapWithNames, allChallengeIds,
   challengeMapWithDashedNames;
 
-Array.zip = function(left, right, combinerFunction) {
-  var counter,
-    results = [];
-
-  for (counter = 0; counter < Math.min(left.length, right.length); counter++) {
-    results.push(combinerFunction(left[counter], right[counter]));
-  }
-
-  return results;
-};
-
 (function() {
   if (!challengeMap) {
     var localChallengeMap = {};