expose personal history data as json api

[chadwhitacre]

Suggested by @qasim in private email.

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[rummik]

+1

[qasimzee]

+1, that was me :)

[jcc8]

Bounty on this issue started at $100: https://www.catincan.com/bounty/expose-personal-history-data-json-api-issue-977-gittip-www-gittip-com-github

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[chadwhitacre]

Closing in light of our decision to shut down Gratipay.

Thank you all for a great run, and I'm sorry it didn't work out! 😞 💃