Autologin

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* Documentation updates

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* Add ``autologin/logged_in`` to scrapy stats
that shows autologin status

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- Python 3.5 support for the Keychain UI interface (Flask-Admin updated)
- Fixed error reporting when extra_js fails to run

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- Provide last response from the target sit received by autologin
in the HTTP API.

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- Database configuration fixed: correct default path,
relative paths not allowed, documentation.
- License mismatch between README and setup.py fixed.

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Initial release