Feature/override identify by#15

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ryanbrunner wants to merge 9 commits intomasterfrom

feature/override_identify_by

Commits on Jan 13, 2016

Refactor payloads into a separate object
Ryan Brunner
committed

Commits on Feb 10, 2016

Payload should build the correct payload version.
Ryan Brunner
committed
Version 1.0
Ryan Brunner
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Registry spec fix
Ryan Brunner
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Version 2 of payload (identify by moves to headers)
Ryan Brunner
committed

Commits on Feb 11, 2016

Actually subscribe to V2.
Ryan Brunner
committed
Upgrade specs to use v2 rather than v1.
Ryan Brunner
committed
Version history in README.md
Ryan Brunner
committed
Allow overriding of identify by fields.
Ryan Brunner
committed