Ensure the extension will work with PHP 5.2 (for some mediawiki 1.19 installs)
formating
Merge branch 'html5' of https://github.com/DaSchTour/JavascriptSlideshow into html5

Conflicts:
	JavascriptSlideshow.hooks.php
Use max-width so that slideshow is scaled down if parent element is too small

- Tested and working fine in IE7, IE8, Chromium 27, Iceweasel 17
- This feature doesn't work in IE6, but the slideshow continues to work
  as before, so no harm there