Remove dependency on ext-tidy

Author: clue

composer.json

@@ -17,8 +17,7 @@
         "php": ">=5.3",
         "react/event-loop": "~0.4.0|~0.3.0",
         "clue/buzz-react": "~0.2.0",
-        "ext-simplexml": "*",
-        "ext-tidy": "*"
+        "ext-simplexml": "*"
     },
     "require-dev": {
         "clue/block-react": "~0.1.0"

src/Io/Loader.php

@@ -13,11 +13,11 @@ public function loadXmlFile($path)
 
     public function loadXmlString($html)
     {
-        // clean up HTML to safe XML
-        $html = tidy_repair_string($html, array(
-            'output-xml' => true,
-            'input-xml'  => true,
-        ));
+        // fix invalid markup of help link in footer of outdated ViewVC versions
+        $html = str_replace('Help</strong></td>', 'Help</a></strong></td>', $html);
+
+        // replace unneeded HTML entities
+        $html = str_replace('&nbsp;', ' ', $html);
 
         // clean up namespace declaration
         $html = str_replace('xmlns="', 'ns="', $html);