Mailprocessing

- Fix issues/3: copy()/move() no longer eats the first email
copied/moved to a newly created folder
- Various small documentation fixes

- Maintenance taken over by Johannes Grassler <johannesbtw23.de>
- Project moved to https://github.com/mailprocessing/mailprocessing
- Standalone maildirproc script split up into a library
- Added imapproc: performs the same task maildirproc does
for remote IMAP folders
- New methods for mail classes: is_seen(), is_flagged()
and strict_mailing_list()

- Tweaks to packaging, no functional changes.

- Added env_sender parameter to forward and forward_copy methods.

- maildirproc is now a Python 3.x project. Install maildirproc-python2 for
Python 2.x compatibility.

- Logs are now printed to the log file in a safe way even if the log string
doesn't fit within the destination character set.