Accept in_reply_to to thread inline comments

The in_reply_to field supplies the id of another comment, enabling
threading. Because id is URL encoded to match a REST API we also
encode the in_reply_to field, allowing clients to correctly line up
messages by simple string equality.

Change-Id: Idc6af51873b9b8a12707c6f4df9d25b627e8b409
6 files changed