Update README.md

Added the URL to view the slideshow.
Fix highlighting in notes.
Merge pull request #2 from taliacarbis/master

Fix highlighting in notes.
WPDB::prepare doesn't need quotes for %s
Merge pull request #3 from pento/patch-1

WPDB::prepare doesn't need quotes for %s
Merge pull request #4 from lukecarbis/master

Update from master.