added Str::ascii method and fixed accented character problem in URL::slug.

application/config/ascii.php

+<?php
+
+return array(
+
+	'/æ|ǽ/' => 'ae',
+	'/œ/' => 'oe',
+	'/À|Á|Â|Ã|Ä|Å|Ǻ|Ā|Ă|Ą|Ǎ|А/' => 'A',
+	'/à|á|â|ã|ä|å|ǻ|ā|ă|ą|ǎ|ª|а/' => 'a',
+	'/Б/' => 'B',
+	'/б/' => 'b',
+	'/Ç|Ć|Ĉ|Ċ|Č|Ц/' => 'C',
+	'/ç|ć|ĉ|ċ|č|ц/' => 'c',
+	'/Ð|Ď|Đ|Д/' => 'D',
+	'/ð|ď|đ|д/' => 'd',
+	'/È|É|Ê|Ë|Ē|Ĕ|Ė|Ę|Ě|Е|Ё|Э/' => 'E',
+	'/è|é|ê|ë|ē|ĕ|ė|ę|ě|е|ё|э/' => 'e',
+	'/Ф/' => 'F',
+	'/ƒ|ф/' => 'f',
+	'/Ĝ|Ğ|Ġ|Ģ|Г/' => 'G',
+	'/ĝ|ğ|ġ|ģ|г/' => 'g',
+	'/Ĥ|Ħ|Х/' => 'H',
+	'/ĥ|ħ|х/' => 'h',
+	'/Ì|Í|Î|Ï|Ĩ|Ī|Ĭ|Ǐ|Į|İ|И/' => 'I',
+	'/ì|í|î|ï|ĩ|ī|ĭ|ǐ|į|ı|и/' => 'i',
+	'/Ĵ|Й/' => 'J',
+	'/ĵ|й/' => 'j',
+	'/Ķ|К/' => 'K',
+	'/ķ|к/' => 'k',
+	'/Ĺ|Ļ|Ľ|Ŀ|Ł|Л/' => 'L',
+	'/ĺ|ļ|ľ|ŀ|ł|л/' => 'l',
+	'/М/' => 'M',
+	'/м/' => 'm',
+	'/Ñ|Ń|Ņ|Ň|Н/' => 'N',
+	'/ñ|ń|ņ|ň|ʼn|н/' => 'n',
+	'/Ò|Ó|Ô|Õ|Ō|Ŏ|Ǒ|Ő|Ơ|Ø|Ǿ|О/' => 'O',
+	'/ò|ó|ô|õ|ō|ŏ|ǒ|ő|ơ|ø|ǿ|º|о/' => 'o',
+	'/П/' => 'P',
+	'/п/' => 'p',
+	'/Ŕ|Ŗ|Ř|Р/' => 'R',
+	'/ŕ|ŗ|ř|р/' => 'r',
+	'/Ś|Ŝ|Ş|Š|С/' => 'S',
+	'/ś|ŝ|ş|š|ſ|с/' => 's',
+	'/Ţ|Ť|Ŧ|Т/' => 'T',
+	'/ţ|ť|ŧ|т/' => 't',
+	'/Ù|Ú|Û|Ũ|Ū|Ŭ|Ů|Ű|Ų|Ư|Ǔ|Ǖ|Ǘ|Ǚ|Ǜ|У/' => 'U',
+	'/ù|ú|û|ũ|ū|ŭ|ů|ű|ų|ư|ǔ|ǖ|ǘ|ǚ|ǜ|у/' => 'u',
+	'/В/' => 'V',
+	'/в/' => 'v',
+	'/Ý|Ÿ|Ŷ|Ы/' => 'Y',
+	'/ý|ÿ|ŷ|ы/' => 'y',
+	'/Ŵ/' => 'W',
+	'/ŵ/' => 'w',
+	'/Ź|Ż|Ž|З/' => 'Z',
+	'/ź|ż|ž|з/' => 'z',
+	'/Æ|Ǽ/' => 'AE',
+	'/ß/'=> 'ss',
+	'/IJ/' => 'IJ',
+	'/ij/' => 'ij',
+	'/Œ/' => 'OE',
+	'/Ч/' => 'Ch',
+	'/ч/' => 'ch',
+	'/Ю/' => 'Ju',
+	'/ю/' => 'ju',
+	'/Я/' => 'Ja',
+	'/я/' => 'ja',
+	'/Ш/' => 'Sh',
+	'/ш/' => 'sh',
+	'/Щ/' => 'Shch',
+	'/щ/' => 'shch',
+	'/Ж/' => 'Zh',
+	'/ж/' => 'zh',
+
+);
\ No newline at end of file

system/str.php

@@ -57,6 +57,21 @@ class Str {
         return function_exists('mb_strlen') ? mb_strlen($value, Config::get('application.encoding')) : strlen($value);
     }
 
+    /**
+     * Convert a string to 7-bit ASCII.
+     *
+     * @param  string  $value
+     * @return string
+     */
+    public static function ascii($value)
+    {
+        $foreign = Config::get('ascii');
+
+        $value = preg_replace(array_keys($foreign), array_values($foreign), $value);
+
+        return preg_replace('/[^\x09\x0A\x0D\x20-\x7E]/', '', $value);
+    }
+
     /**
      * Generate a random alpha or alpha-numeric string.
      *

system/url.php

@@ -109,6 +109,8 @@ class URL {
 	 */
 	public static function slug($title, $separator = '-')
 	{
+		$title = html_entity_decode(Str::ascii($title), ENT_QUOTES, Config::get('application.encoding'));
+
 		// Remove all characters that are not the separator, letters, numbers, or whitespace.
 		$title = preg_replace('![^'.preg_quote($separator).'\pL\pN\s]+!u', '', Str::lower($title));