renamed tokenizer class for pear-style class name compat

Author: staabm

src/CodeCoverage/Report/Node/File.php

@@ -351,7 +351,7 @@ public function getNumTestedFunctions()
      */
     protected function calculateStatistics()
     {
-        $tokenizer = new Tokenizer($this->getPath());
+        $tokenizer = new PHP_CodeCoverage_Util_Tokenizer($this->getPath());
         $tokenizer->tokenize();
 
         $classes = $tokenizer->getClasses();

src/CodeCoverage/Util/Tokenizer.php

@@ -1,6 +1,6 @@
 <?php
 
-class Tokenizer {
+class PHP_CodeCoverage_Util_Tokenizer {
     private $filename;
     private $functions = [];
     private $classes = [];