Add User endpoint (no user_meta handling) - #128

Phew; tonnes of inline comments above, but fantastic start on this! Thanks so much for what you have so far!

Feel free to ask any questions about anything I've mentioned; you can also email me directly if you'd prefer. :)

Thanks for the comments. I'll move things forward, with individual commits. Then when you're ready to pull I can squash them all together into one.

Meanwhile, I'm wondering if there should be a class for each User called API_User or something, that we can work with, and that the API code can automatically render as a dictionary using introspection, before being rendered further as JSON. Tom Christie's (@tomchristie) Django REST Framework is quite gorgeous in this respect and might be worth looking at: http://www.django-rest-framework.org/ I've also noticed that user roles and per-user capabilities are all stuffed into one meta item... that'll be interesting to handle with a RESTful API. Anyway, I digress. I imagine these comments belong elsewhere.

You can now add a user. More to come, but my six-year-old just woke up.

I've now done everything @rmccue has suggested, I think, apart from pagination, as explained above.

@rmccue has pointed out that "current_user_can('edit_user', $id) is called a meta cap. It maps to the correct real permission internally (edit_users/edit_profile or appropriate other permission).". So I'll update that.