bridge (constructor): refactoring: - constructors are now in separate modules - constructors are discovered dynamically - factorised generation code from D-Bus in base Constructor. - A generic generation method is now available in base Constructor, using python formatting. - removed bridge/bridge.py in core as it was useless, may come back in the future if needed

# FIXME: remove this when RSM and MAM are in wokkel
# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
import wokkel
from sat.tmp.wokkel import pubsub as tmp_pubsub, rsm as tmp_rsm, mam as tmp_mam
wokkel.pubsub = tmp_pubsub
wokkel.rsm = tmp_rsm
wokkel.mam = tmp_mam