plugin email invitation: fixed create/simpleCreate + invitee_name: - fixed invitationSimpleCreate signature - fixed nicknames settings in create - use async coroutines - guest jid is now stored (as a string), avoiding the need to check profile to retrieve it - invitee_name is now needed in invitationSimpleCreate

# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
# TODO: remove this when changes are merged in Wokkel
from sat_tmp.wokkel import install
install()