Kairos

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Bulk inserts into Redis batch TTL calls

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Added parameter "duration" to custom transforms to facilitate rate
calculations. This is a breaking change. Added more documentation on
custom transforms.

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Implemented support for creating a Timeseries using a URL
https://github.com/agoragames/kairos/pull/45

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Fixed calculation of relative TTLs
https://github.com/agoragames/kairos/pull/44

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Replace print statements with warnings for unsupported backends from akabos
https://github.com/agoragames/kairos/pull/40

Added `Timeseries.bulk_insert` with optimized Redis and Mongo implementations
https://github.com/agoragames/kairos/pull/41

Fixed relative TTLs for Redis and Cassandra, fixng 14
https://github.com/agoragames/kairos/pull/42

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Implemented gevent-compatible Cassandra connection pooling.

Changed the API for Cassandra custom fetch functions.

Any value inserted into a timeseries of ascii, text, blob type will be
auto-quoted with single quote.

Fixed mongo escaping of values with periods by replacing with "U+FFFF"
unicode character.