ENH: Merge branch 'datetime_dev'

Highlights:

* Tighten up date unit vs time unit casting rules,
  and integrate the NPY_CASTING enum deeper into the datetime conversions
* Determine a unit when converting from a string array,
  similar to when converting from lists of strings
* Switch local/utc handling to a timezone= parameter,
  which also accepts a datetime.tzinfo object. This, for
  example, enables the use of the pytz library with numpy.datetime64
* Remove the events metadata, make the old API functions raise
  exceptions, and rename the "frequency" metadata name to "timeunit"
* Abstract the flexible dtype mechanism into a function,
  so that it can be more easily changed without having to
  add code to many places

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