add style-for-ghpages task for generating ghpages CSS; add 'ghpages' task grouping all ghpages tasks
factor out imagesBaseUrl so that it's set in one place only; switch to renderChart() in top-level Example class
updates to tooling around generating ghpages example
Merge branch 'master' into jebeck/show-tabular-basal-settings

Conflicts:
	example/example.js