views_slideshow 7.x-3.9

Known Regressions:
- [288739] Due to changes required to fix a bug with pagers in some cases, the Views Slideshow generated ID has changed on some slideshow. In most cases this will not be a problem, however, if you are targeting this ID with your custom CSS or JS, this will cause problems.

Minor bug release.

Changes since 7.x-3.8:

• Ensure module_path is set in rare circumstances.
• Fix: PHP 7.1 compatibility: initialize variables as array not empty strings
• remove unused variable.
• Doc string/comment improvements.
• #2881984 by NickWilde: Error: The aria-labelledby attribute must point to an element in the same document
• #2877725 by sickness29: Active class disappears from pager
• Improve API homepage tesxt slightly.
• fix docstring on drush_views_slideshow_cycle_easing()
• Adding missing @file docstring to views_slideshow.developer-documentation.php