Give an access to the inbox count value

[obsidev]

Pull Request for Improvement.

Summary of Changes

The login controller just provided the "inboxCount" which is a string but it can be useful to also have the number value.
Thanks to that it can be possible in the "login" layout widget, to display the counter in a small label just near the avatar icon (or as a stamp).
The users will then have a direct information of their inbox status without having to open their profile menu.

Testing Instructions

In the layout "widget/login/logout/default.php" is it then possible to add the code:

<?php if (!empty($this->pm_link) && $this->inboxCountValue > 0) : ?>
        <span class="inbox-counter"><span class="label label-info"><?php echo $this->inboxCountValue; ?></span></span>
<?php endif; ?>

Just before the display of the avatar image (and also add some CSS to improve the display).