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

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));