Turboactivate

Changed

* Let `TurboActivateConnectionDelayedError` and `TurboActivateConnectionError` bubble up. (Thanks
to cbenhagen).

Changed

* `TurboActivate.activate()` throws an exception if activation fails

Changed

* Calling `SetCustomActDataPath` under Linux will raise a runtime exception since the method is not
available on that platform.

Added

* `TurboActivate.is_date_valid()` now accepts an optional `date` parameter, which must be a
string.


Fixed

* We use the correct buffer allocation scheme when using `GetFeatureValue`.'
* Solved a packaging problem (README.rst was not included in the distribution).

First public version