3.2.0

New major release!

• announcement.
• upgrade instructions.

Changelog since last beta

• The default ACL rules allow an unauthenticated user to read information
  about nodes that don't have their own ACL defined. This was a security
  problem.
• The zip release ships with sabre/vobject 4.1.0,
  sabre/http 4.2.1, sabre/event 3.0.0,
  sabre/uri 1.1.0 and sabre/xml 1.4.2.