Implemented support for Gregorian data intervals `[daily, weekly, monthly, yearly]`
New API for `Timeseries.series()`, with optional arguments `start` and `end` replacing the old argument `timestamp`. See README for documentation.
0.2.2
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Fixed bug in fetching mongo series, which was missing the stat name in the query.
0.2.1
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Added ability to pass in a list of transforms, to support multiple calculations per row of the data set.
0.2.0
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Implemented support for storing data in mongo.
Transforms on histograms will be called with a dictionary object, not a list, to reduce the time and memory footprint required to run calculations on the data.
0.1.5
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Fixed bug in turning relative interval definitions into integers for calculations in get() and series().