Kairos

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Fixed increment by integer on a Count series.

Turn off transactions in Redis pipelines.

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Added simple transforms on all timeseries and ability to apply any function
to a row of data when calling `get` and `series`.

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Added ability to specify 'step' and 'resolution' in terms of hours, days,
weeks, months and year.

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Beta of kairos for redis, significantly refactors the API. All types of
timeseries are created with the Timeseries constructor. The arguments to
the constructor have been changed to simplify and clarify their usage. In
particular, a single timeseries implements only a single type (e.g. Histogram)
read and write functions are shared by all intervals in a timeseries, and the
count_only support is now the timeseries type `count`. See README for details.

Added exceptions. Only exception currently implemented is UnknownInterval.

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If tracking only counts and resolution=interval, handle an interval without data

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Added optional compression on a series which will count unique hits on a
value within an interval. Exact time resolution is traded in favor of
a (possible) significant reduction in storage requirements. The resolution
of the compression is up to the user in how they cast the data on insert.