Muacrypt

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- fix 82: properly lowercase e-mail addresses coming in autocrypt headers

- avoid duplicate entries in peerstate for incoming messages

- new scandir option "--reparse" which forces re-processing an
already known message -- by default already parsed messages
are ignored.

- add --reparse and --account option to process-incoming subcommand

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- support and document a viable mutt/muacrypt integration

- all subcommands which take an account name now do it
through the "-a" or "--account" option.

- add "muacrypt import-public-key" subcommand to integrate
a key with a specified prefer-encrypt setting and e-mail
address.

- add "scandir-incoming" subcommand to scan maildirs
for incoming mail and Autocrypt headers.

- add "peerstate EMAILADR" command which shows Autocrypt
and key state for a given peer.

- renamed "test-email" to "find-account" subcommand as
it is about finding the account for a particular (own) e-mail address.

- make muacrypt fail by default in process-outgoing/sendmail
if no muacrypt account could be determined for an outgoing mail

- fix test suite with --no-test-cache run

- disable warnings for pytest_localserver's smtp support

- add muacrypt version to pytest report header

- refine tests for process-incoming and autocrypt timestamps

- use stable serializers/unserializers from the cross-py2/py3 execnet package

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- adapt test integration with latest pytest

- fix py27/py35 str/bytes configuration saving issue

- with "muacrypt status" only show
peer-information when "-v|--verbose" is specified

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- fix project description

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- fixed changelog

- 74 allow unicode To addresses in process-sendmail/outgoing

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- reply to multiple CC'ed recipients with the bot so we can test
gossip.

- introduce plugin architecture with hooks on incoming/outgoing mail
and for adding new subcommands.

- add Autocrypt-Gossip headers to mails with multiple recipients.

- parse gossip headers with the bot.

- refine recommendations and add command line call

- add way to add subcommands from a plugin

- moved repo to hpk42/py-autocrypt and refined entry pages to link
to new IRC channel and mailing list and describe the aims.

- removed "init" subcommand. you can now directly use "add-account".

- completely revamped internal storage to use append-only logs.
all state changes (and in particular Autocrypt header processing)
is tracked in immutable entries.

- with gpg2 we now internally use a hardcoded passphrase to avoid
problems with gpg-2.1.11 on ubuntu 16.04 which does not seem
to allow no-passphrase operations very well.

- 22 introduce account.encrypt_mime and account.decrypt_mime API
(not yet exposed to cmdline).

- make tests work against gpg 2.0.21, gpg-2.1.11 (and likely higher
versions but those are hard to custom-build on ubuntu or older debian
machines)

- introduce decrypt/encrypt support for the bot and implement
the autocrypt Level 1 recommendation algorithm for determining
if encryption should happen or not.