metomi/rose#316: outline
metomi/rose#316: finish content
metomi/rose#316: tidy
metomi/rose#316: add to index
metomi/rose#316: restyle
metomi/rose#316: standardise heading style
metomi/rose#316: update
metomi/rose#316: remove merge conflict
Merge pull request #327 from benfitzpatrick/316.adv-tut-trigger

#316 - advanced tutorial for trigger metadata