Merge pull request #32 from aykevl93/master

geef 'start slideshow' alleen als er >1 afbeeldingen in een album zijn.
Added comment to convertzp.php (that it can be ignored)
Merge pull request #37 from aykevl93/ayke-add-comment

Added comment to convertzp.php (that it can be ignored)
Added Google Analytics

Just copied the GA-javascript from the main page ;)