Piconnect

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* Fixes the Exception type to swallow (related to 580)
* Fixes missing dependency in wheel (595)

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.. warning:: This is the final version to support python 2.7

* Added support to write values to the databases (573)
* Added support for extracting Event frames from PI-AF (587)
* Added methods to extract a single historic value from both `PIPoint` and `PIAFAttribute` objects. (523)
* Added options to login to the PI Server using provided credentials (522)
* Added option to set the connection timeout for data extraction (572)
* Better loading of the configured servers (580)
* All data extracting functions now support both extraction using strings and `datetime` objects. (574)

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* Added option to configure the timezone for the returned index. Changed default from Europe/Amsterdam to UTC! Adds `pytz` as new dependency(499)
* More robust detection of the default PI AF server (496, 501)
* Removed `pytest-runner` dependency unless explicitly requested (503)
* Exiting the context manager for a `PIAFDatabase` no longer explicitly disconnects from the server, but leaves it up to SDK. (487)
* Various updates of the package dependencies

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* Improved documentation
* Changed `PIData.PISeriesContainer` to an Abstract Base Class

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* Add `summary`, `summaries`, and `filtered_summaries` methods to `PIPoint`
and `PIAFAttribute`

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