removed duplicate methods from String class

app/classes/string.php

@@ -25,10 +25,6 @@ public static function uncamelize($str) {
     return preg_replace('/(?<=[a-z])([A-Z])/e', "'-' . strtolower('\\1')", $str);
   }
 
-  public static function startsWith($haystack, $needle) {
-    return strncmp($haystack, $needle, strlen($needle)) === 0;
-  }
-
   static function isFalse($val) {
     return (!$val || $val == 'false' || $val == 'no');
   }
@@ -50,18 +46,6 @@ static function getFirstLine($text) {
     return trim($pos ? substr($text, 0, $pos) : $text, "\r");
   }
 
-  /**
-   * Generate string of random characters
-   * @param int $len
-   * @return string
-   */
-  static function random__($len) {
-    static $z = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
-    $slen = strlen($z) - 1;
-    for($s = ""; $len > 0; $len--) $s .= substr($z, rand(0, $slen), 1);
-    return $s;
-  }
-
   /**
    * Implode using printf formatting
    * @param string $glue Glue for implode