Merge pull request #10 from rpatterson/master

Recursively cleanup multipart payloads for encoding.
prep for 3.2
Avoid resource leak warnings under Python 3.2.
Test that properly-encoded binary attachments work.
Fix for Python 2.5 / Jython.
This works in Python 2 and 3.
Moar Python 2.5 BBB pinning.
Merge branch 'master' of https://github.com/pumazi/repoze.sendmail into pumazi-master
Tense moment.
Garden changelog.
FIX: Python3 transactions and sqlalchemy

When used together with transaction and sqlalchemy,
it results in TypeErrorTypeError: unorderable types: int() < str().
SQLAlchemy uses string as sortKey while this uses int as sortKey
and these just does not work together in python3.
Bump version to 4.0 due to supported platforms:

- Drop support for Jython until a Jython-2.7-compatible version of
  ``zope.interface`` becomes available.

- Drop support for Python 2.5.

- Add suupport for Python 3.3.
Remove BBB for Python 2.5.
Merge branch 'patch-1' of https://github.com/hleumas/repoze.sendmail into hleumas-patch-1
Add a test for the value returned by 'sortKey'.
Merge branches 'hleumas-patch-1' and 'master'
Prep 4.0b1 release.
Back to development.
Drop claim to support Python 2.5

Closes #16