__construct'ify all main library classes.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1459 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Printer.php

@@ -22,7 +22,7 @@ class HTMLPurifier_Printer
     /**
      * Initialize $generator.
      */
-    public function HTMLPurifier_Printer() {
+    public function __construct() {
         $this->generator = new HTMLPurifier_Generator();
     }