Merge branch 'release/v0.1b'
Use dashes in JSON API resource names

See bugzilla bug 1063550
Add sample data for /api/views/feature-sets/xxx

See bug 1066301
Drop canonical flag, zxx translations

Feedback from Jeremie, confirmed by MDN team
Bug 1066301
Merge feature and feature-set

Fixes Bug 1063133 (by dropping feature-sets)
Done as part of Bug 1066301
Replace feature.maturity with flags

Documentation fixes for bug 1063570, but waiting for implementation to
close.  Part of bug 1066301.