initial fixes
Merge branch 'master' into 432.tut-suite-valid
Fix tutorial
fix advanced tutorials
Tidy advanced tutorial
extra task runtime
index.html fix
improve
Merge pull request #442 from benfitzpatrick/407.fix

#407: index.html update
Merge pull request #441 from benfitzpatrick/432.tut-suite-valid

#432: ensure tutorial suites pass strict validation