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 branch 'master' of github.com:lukecarbis/better-faster-stronger into personal-touches