- Change `stream_name` into `stream_id` on some API endpoints that use
`stream_name` in their URLs to prevent confusion of `views` selection.
For example:
If the stream name is "foo/members", the URL would be trigger
"^streams/(?P<stream_name>.*)/members$" and it would be confusing because
we intend to use the endpoint with "^streams/(?P<stream_name>.*)$" regex.
All stream-related endpoints now use stream id instead of stream name,
except for a single endpoint that lets you convert stream names to stream ids.
See https://github.com/zulip/zulip/issues/2930#issuecomment-269576231
- Add `get_stream_id()` method to Zulip API client, and change
`get_subscribers()` method to comply with the new stream API
(replace `stream_name` with `stream_id`).
Fixes#2930.