Updated Manifest for ruby#115

Author: drbrain

Manifest.txt

@@ -48,6 +48,7 @@ lib/rdoc/generator/template/darkfish/_sidebar_sections.rhtml
 lib/rdoc/generator/template/darkfish/_sidebar_table_of_contents.rhtml
 lib/rdoc/generator/template/darkfish/class.rhtml
 lib/rdoc/generator/template/darkfish/images/add.png
+lib/rdoc/generator/template/darkfish/images/arrow_up.png
 lib/rdoc/generator/template/darkfish/images/brick.png
 lib/rdoc/generator/template/darkfish/images/brick_link.png
 lib/rdoc/generator/template/darkfish/images/bug.png