Processor

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* IMAP source was fixed to work with new IMAPClient's API and
support ``IMAPClient > 1.0.0``.
* Datastorage was fixed to get ``filename`` from ``PROCESSOR_DB``
environment variable in case if it was setup using
``os.environ['PROCESSOR_DB'] = 'some.db'`` after the imports.

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Code was fixed to work with HyLang from ``a3bd90390cb37b46ae33ce3a73ee84a0feacce7d``
commit. Please, use this pinned version of HyLang and `subscribe`_ on future
release notes to know when this requirement will change.

.. _subscribe: https://allmychanges.com/p/python/processor/

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* Code was fixed to work with latest Hy, from GitHub.
* Added ``twitter.mentions`` source, to read stream of mentions from the Twitter.
* Fixed a way how number of messages from IMAP folder is limited. Previously
limit was applied even when we already know an ID of the last seen message,
but now limit is ignored in this case and only applied when visiting the
folder first time.

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New output – XMPP was added and now processor is able
to notify Jabber users.

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The biggest change in this release is a new source – ``github.releases``.
It is able to read all new releases in given repository and send them into
processing pipeline. This works as for public repositories, and for private
too. `Read the docs`_ for futher details.

.. _Read the docs: https://python-processor.readthedocs.org/en/latest/sources.htmlgithub-releases

Other changes are:

* Storage backend now saves JSON database nicely pretty printed for you could read and edit it in your favorite editor. This is Emacs, right?
* Twitter.search source now saves state after the tweet was processed. This way processor shouldn't loose tweets if there was exception somewhere in processing pipeline.
* IMAP source was fixed and now is able to fetch emails from really big folders.

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Good news, everyone! New output was added - ``email``.
Now Processor is able to notify you via email about any event.