new UI
Merge branch 'workshop' of github.com:stackgl/webgl-workshop into workshop
style tweaks
Merge remote-tracking branch 'origin/intro-lessons' into workshop
make exercises visible!
fix typo
italicise code in paragraphs
Merge branch 'master' into exercise-ui
make the home button work
annotations for javascript too
Google Analytics

Tracks exercise visits as page views, and button clicks as events.
Will, before release, count the number of attempts a user has made
on a particular exercise.

This should provide very useful insight into the difficulty curve
of the workshop and general usage patterns.

Analytics is enabled by default, but explained alongside the menu
and convient to opt out of.
Merge remote-tracking branch 'origin/master' into exercise-ui

Conflicts:
	package.json