Dropped date utility class

Only had one function and it was referencing the time class. Moved date tests
to the time tests because it seemed like a more comprehensive set of tests.

src/Date.php

@@ -1,39 +0,0 @@
-<?php
-
-/**
- * Date Utility Collection
- *
- * Licensed under The MIT License
- * Redistribution of these files must retain the above copyright notice.
- *
- * @copyright Copyright 2007-2014, Josh Sherman
- * @license   http://www.opensource.org/licenses/mit-license.html
- * @link      http://picklesphp.com
- * @package   Pickles
- */
-
-namespace Pickles;
-
-/**
- * Date Class
- *
- * Just a simple collection of static functions to accomplish some of the more
- * redundant date related manipulation.
- */
-class Date
-{
-    /**
-     * Age
-     *
-     * Calculates age based on the passed date.
-     *
-     * @static
-     * @param  string $date birth / inception date
-     * @return integer $age number of years old
-     */
-    public static function age($date)
-    {
-        return Time::age($date);
-    }
-}
-