Added TResult generic to chainable _(...).pluck methods

This is needed because there is no way to cast the output in the middle of the chain.

This is not be done on _.pluck() methods because T cannot be inferred.  In other words, this:

    <number>_.pluck(objectArray, 'id');

or this:

    var id: number = _.pluck(objectArray, 'id');

is cleaner than this:

    _.pluck<IMyObjectInterface, number>(objectArray, 'id');

lodash/lodash.d.ts

@@ -3548,16 +3548,16 @@ declare module _ {
         /**
         * @see _.pluck
         **/
-        pluck<T extends {}>(
-            property: string): LoDashArrayWrapper<any>;
+        pluck<TResult>(
+            property: string): LoDashArrayWrapper<TResult>;
     }
 
     interface LoDashObjectWrapper<T> {
         /**
         * @see _.pluck
         **/
-        pluck<T extends {}>(
-            property: string): LoDashArrayWrapper<any>;
+        pluck<TResult>(
+            property: string): LoDashArrayWrapper<TResult>;
     }
 
     //_.reduce