metomi/rose#316: fail-if page
training: fail-if tutorial
metomi/rose#316: tidy
metomi/rose#316: fix
metomi/rose#316: tidy
metomi/rose#316: better name
metomi/rose#316: add all explanation
metomi/rose#316: implement feedback
metomi/rose#316: restyle
metomi/rose#316: tidy
metomi/rose#316: warning
Merge pull request #324 from benfitzpatrick/316.adv-tut-fail-if

#316 - advanced tutorial for fail-if and warn-if