[gmime] Created tag 2.3.1

[Jeffrey Stedfast <fejj src gnome org>]

The unsigned tag '2.3.1' was created.

Tagger: Jeffrey Stedfast <jestedfa microsoft com>
Date: Tue Feb 7 12:06:31 2017 -0500

    Tagged for 2.3.1

Changes since the last tag '2.3.0':

Jeffrey Stedfast (16):
      Removed as GMimeObject has an equivalent method.
      don't use deprecated functions
      don't use deprecated functions
      Updated for list.[c,h] changes.
      go back to using base64_encode_step() instead of base64_encode_close() for encoding boundary
      Updated for GMimeHeaderList and GMimeObject changes.
      New set of unit tests for GMimeHeaderIter.
      Use iters to copy the headers.
      New function to get at the GMimeObject headers.
      fixed a gtk-doc comment
      fixed some gtk-doc comments
      Updated.
      updated bindings
      Added GMimeCipherHash enums for SHA-224, SHA-256, SHA-384 and SHA-512.
      Only unlink the iter if the headers are being destroyed.
      Bumped version