Reduce _.pluck.

Former-commit-id: 91db56f95d258070a0d25e4e4b74917e52b8cefe

build.js

@@ -132,7 +132,7 @@
     'pairs': ['forOwn'],
     'partial': ['isFunction', 'isObject'],
     'pick': ['forIn'],
-    'pluck': ['forEach'],
+    'pluck': ['map'],
     'random': [],
     'range': [],
     'reduce': ['forEach'],

lodash.js

@@ -2346,11 +2346,7 @@
    * // => ['moe', 'larry', 'curly']
    */
   function pluck(collection, property) {
-    var result = [];
-    forEach(collection, function(value) {
-      result.push(value[property]);
-    });
-    return result;
+    return map(collection, property + '');
   }
 
   /**