User id array in shift notification is ignored.

[RichAyotte]

Hi, I might have found a bug in your API. When I pass a user_id array to the notify endpoint, all qualified users are notified instead of the ids in the array, Here's a sample json that I'm including in the POST body.

Doing a post to
shifts/notify/999999999

body:
{"user_id":["44444444"]}

5 notifications were sent with this. Here's the response.

(
[success] => 1
[email] => 5
[sms] => 0
)

This isn't a problem with the class that you created but I'm having a terrible time getting to your support team so I'm trying this.