Rename the function channelmessage2zerver_message to channelmessage2zerver_message_for_one_stream.
Compress the converted data with tar instead of zip.
Add changes in zerver_userprofile mapping and zerver_realm mappings.
Do the manage.py import from a directory instead.
In order to keep all three packages (zulip, zulip_bots,
zulip_botserver) in the same repo, all package files must now
be nested one level deeper.
For instance, python-zulip-api/zulip_bots/zulip_bots/bots/, instead
of python-zulip-api/zulip_bots/bots/.