Torrt

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* Torrents without URL in comment won't issue exceptions anymore.
* Added request timeout, defaults to 10 sec.
* IMPORTANT: HTML parsing now requires `lxml` module.
* `--verbose` option now works with all commands.

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* Fixed rutracker torrents download.

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+ Implemented tracker mirrors support.
* --version command arg made py3 compatible.
* rutracker.org torrent file download fix.

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+ Implemented Notifications subsystem.
* get_registerd_torrents() is deprecated in favor of get_registered_torrents().

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* Now removes outdated torrents from torr when walking.

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* Now less verbose.
* Now removes outdated torrents from clients when walking from CLI.