Add address3 field to the AddressResource and sample payloads.
Update the donation webhook sample payloads.

They have a version field as well, and nation_slug was missing in one of them.
Update the donations webhook text to reflect that the webhook version is now editable.
Add people api and webhooks sample payloads and skeleton for the person resource.
Remove unused person resource markdown.
Add person resource field descriptions.
Add values to people api and webhook payload samples.
Complete descriptions for the people api resources.
Add author and recruiter to people webhook sample payloads.
Add a missing quotation mark to the people api sample json.
Update people_api.md

Minor nitpicks.
Merge pull request #11 from 3dna/miki/people_api_extension

Miki/people api extension