Design guide: Changed blockquote page to quotations page, including adding a section on inline quotes.

Fixes #214
Merge pull request #215 from pjackson28/fixquotations

Design guide: Changed blockquote page to quotations page, including adding a section on inline quotes.
Renamed 'Dismissible alert' to 'Collapsible alerts'

Plus, added the Collapsible alerts to the ToC.
Merge pull request #217 from Pacoup/master

Renamed 'Dismissible alert' to 'Collapsible alerts'
Update the v3.1 banner on the Web site to reflect that v3.1 is no longer supported and has been moved to wet-boew-legacy.
Merge pull request #221 from thomasgohard/v3.1-notice

Update the v3.1 banner on the Web site to reflect that v3.1 is no longer supported and has been moved to wet-boew-legacy.
Merge remote-tracking branch 'upstream/master'