Sprockets-influxdb

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- Submit measurements one at a time for a rejected batch, logging error responses

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- Have a default content length for responses without one

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- Move to millisecond precision

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- Remove ``content_type`` tag

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- Rework how the line protocol is marshalled and support the various data types.
- Remove the accept tag
- Strip down content_type to the ``type/subtype`` format only
- Make ``correlation_id`` a field value and not tag
- Change the precision to second precision, per the InfluxDB docs (use the most
coarse precision for better compression)

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- Add a response ``content_length`` field, an ``accept`` tag (if set in request
headers), and a response ``content_type`` tag.