Smk-python-sdk

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Backwards compatible:

- Fixed installation on Python 3 (not the whole package is Python 3-compatible
yet but installation works)


Backwards incompatible:

- Removed smarkets.datetime.iso8601_to_datetime (parse_datetime is recommended
instead, do note they have different interfaces)

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- Merge smkcommon project
- Refactor documentation

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- Create separate logger for "flushing x payloads" message

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- Update SETO definitions

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- Stop requiring curl/piqi/protoc if installing distribution

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- Handle order reference property
- Remove per-message streaming API callbacks
- Remove unused API

0.4.x/0.3.x
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Change list available only in git log.