Dropped gravatar method

Seems I had a method in the string class that referenced the now removed
gravatar API wrapper. Dropped the method and the associated test.

src/classes/String.php

@@ -44,25 +44,6 @@ class String
         return preg_replace('/^(\d{3})(\d{3})(.+)$/', $replacement, $number);
     }
 
-    // }}}
-    // {{{ Generate Gravatar Hash
-
-    /**
-     * Generate Gravatar Hash
-     *
-     * Generates a hash from the passed string that can then be used for
-     * fetching an avatar from Gravatar.com
-     *
-     * @deprecated
-     * @static
-     * @param  string $string string to hash, should be an email address
-     * @return string resulting hash
-     */
-    public static function generateGravatarHash($string)
-    {
-        return API_Gravatar::hash($string);
-    }
-
     // }}}
     // {{{ Generate Slug
 

tests/classes/StringTest.php

@@ -25,22 +25,6 @@ class StringTest extends PHPUnit_Framework_TestCase
         ];
     }
 
-    /**
-     * @dataProvider providerGenerateGravatarHash
-     */
-    public function testGenerateGravatarHash($a, $b)
-    {
-        $this->assertEquals(String::generateGravatarHash($a), $b);
-    }
-
-    public function providerGenerateGravatarHash()
-    {
-        return [
-            ['foo@bar.com', 'f3ada405ce890b6f8204094deb12d8a8'],
-            ['FOO@BAR.COM', 'f3ada405ce890b6f8204094deb12d8a8'],
-        ];
-    }
-
     public function testIsEmpty()
     {
         $this->assertTrue(String::isEmpty(''));