[Telepathy] ANNOUNCE: telepathy-spec 0.27.4

[Alexander Akulich]

The "three plus one" release.

tarball: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.27.4.tar.gz
signature: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.27.4.tar.gz.asc
git: http://cgit.freedesktop.org/telepathy/telepathy-spec

Changes:
• Chan.I.Messages defines a new well-known header key: "silent".
• Conn.I.IRC_Command1 is now actually marked stable.
• ConnectionManager defines a new well-known parameter: "account-path-suffix".
• Chan.I.SASLAuthentication mechanism X-TELEPATHY-PASSWORD is not mandatory
  if unimplementable.
• Tools ported to Python 3.
• Documentation now uses Jinja2 instead of Cheetah for templates.