Merge master branch into gh-pages and close master#406

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richardwestenra wants to merge 4 commits intogh-pagesfrom

Commits on Mar 20, 2018

missing class from the tutorial example
stampycode
authored

Commits on Mar 21, 2018

lowercase 'c'
stampycode
authored

Commits on Jul 26, 2018

Merge pull request #389 from stampycode/patch-1
despo
authored

Commits on Oct 18, 2018

Merge branch 'gh-pages' into master
richardwestenra
authored