Left-align h3 headings
Left-align h3 headings

Because centring the headings over top of bullets looks really weird.

Signed-off-by: Dan Scott <2591e5f46f28d303f9dc027d475a5c60d8dea17a@coffeecode.net>

GerHobbelt/reveal.js,GerHobbelt/reveal.js,GerHobbelt/reveal.js