plugin XEP-0329: download thumbnails: - thumbnails are now downloaded directly when BoB is used, `filename` is then filled - `utils.asDeferred` is now used for Jingle methods, so `async` coroutines can be used - (XEP-0231): fixed `dumpData`

# 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()