Beginnings of clock triggered tutorial.
Merge remote branch 'upstream/master' into clock-triggered-tutorial
Further fleshing out and skeleton of tutorial slides.
15-minute examples added to tutorial.
Interim commit.
Grammar, punctuation and typo corrections.
Ran through tidy.
Fixed semicolon.
Implement feedback.
Fixed a heading.
Missing word.
Merge pull request #757 from arjclark/clock-triggered-tutorial

rose tutorials: clock triggered tasks