Add lazy _.pluck and _.where. [closes #776]

lodash.js

@@ -10190,6 +10190,16 @@
       };
     });
 
+    // add `LazyWrapper` methods for `_.pluck` and `_.where`
+    arrayEach(['pluck', 'where'], function (methodName, index) {
+      var operationName = index ? 'filter' : 'map',
+          getCallback = index ? matches : property;
+
+      LazyWrapper.prototype[methodName] = function (arg) {
+        return this[operationName](getCallback(arg));
+      };
+    });
+
     LazyWrapper.prototype.dropWhile = function(iteratee, thisArg) {
       iteratee = getCallback(iteratee, thisArg, 3);