Signup API endpoint

[aaronschachter]

Enables the campaigns/[nid]/endpoint and allows uid and source to be passed as Signup properties.

Adds new permission edit any signup which is checked when a request is made when the uid does not match the logged in user's uid.

POST /api/v1/campaigns/1273/signup HTTP/1.1
Host: dev.dosomething.org:8888
Content-Type: application/json
Accept: application/json
X-CSRF-Token: efkrSDe0fJg6sqseLcIVv7XFxTRb3npxmHFrapRru6U
Cache-Control: no-cache

{ "uid": 15, "source": "api jam" } 

Response: Signup sid, if success.

[
    "1307"
]

[sergiitk]

👍