Windows classmap portability

- Paths should use DIRECTORY_SEPARATOR concatenation to ensure
  portability when generated on Windows and pushed to *nix
  - "' . DIRECTORY_SEPARATOR . '" replaces actual character
  - which requires replacing "\'" with "'" in final generation

bin/classmap_generator.php

@@ -126,6 +126,9 @@
     $namespace = empty($file->namespace) ? '' : $file->namespace . '\\';
     $filename  = str_replace($strip, '', $file->getRealpath());
 
+    // Replace directory separators with constant
+    $filename  = str_replace(array('/', '\\'), "' . DIRECTORY_SEPARATOR . '", $filename);
+
     $map->{$namespace . $file->classname} = $filename;
 
     return true;
@@ -139,6 +142,9 @@
 // Prefix with __DIR__; modify the generated content
 $content = preg_replace('#(=> )#', '$1__DIR__ . DIRECTORY_SEPARATOR . ', $content);
 
+// Fix \' strings from injected DIRECTORY_SEPARATOR usage in iterator_apply op
+$content = str_replace("\\'", "'", $content);
+
 // Write the contents to disk
 file_put_contents($output, $content);