Pyramid-mailer

-----------------

- Issue 29: Allow setting Content-Transfer-Encoding for body and html
via Attachments.

- Issue 32: Fix handling of messages with both HTML and plain text
bodies that also have attachments.

- Issue 24: ensure that ``pyramid_mailer.response.to_message`` returns
text under Python 3.x.

- Dropped support for Python 2.5.

-----------------

- Set default transfer encoding for attachments to ``base64`` and allow
an optional ``transfer_encoding`` argument for attachments. This currently
supports ``base64`` or ``quoted-printable``.

- Properly handle ``Mailer.from_settings`` boolean options including ``tls``
and ``ssl``.

- Support ``setup.py dev`` (installs testing dependencies).

- Use ``setup.py dev`` in tox.ini.

----------------

- Add a test for uncode encoding in multipart messages.

- Depend on ``repoze.sendmail`` >= 3.2 (fixes unicode multipart message
encoding).

----------------

- Work around a Python 3.2.0 bug in handling emails with empty headers. This
allows cc-only and bcc-only emails to be handled properly on all platforms
(no recipient= required anymore). See
https://github.com/Pylons/pyramid_mailer/issues/14.

----------------

- Packaging release

----------------

- Use ',' as an email header field separator rather than ';' when multiple
values are in the same header (as per RFC822).

- Allow lists of recipient emails to be tuples or lists (previously it was
just lists).

- Don't include ``Bcc`` header in mail messages (breaks secrecy of BCC).
See https://github.com/Pylons/pyramid_mailer/pull/10