Update code/controllers/DocumentationViewer.php

BUGFIX: fixed false variable name in DocumentationViewer::set_recursive_submenu()
Update code/controllers/DocumentationViewer.php

BUGFIX: fixed mechanism to get nested page entities when using upper case chars as the first char of a markdown files name or a folders name
Merge pull request #24 from sdiel/patch-1

Ensure comparison is case insensitive.
Merge pull request #23 from sdiel/patch-1

Update code/controllers/DocumentationViewer.php