primitivus, jp: dynamic bridge + fixed D-Bus bridge:

Primitivus and jp can now load the bridge specified in sat.conf, but they are only working with D-Bus so far (need to change all sync calls to async).
    Exit code 3 is used for Bridge init error.

frontends/src/bridge/bridge_frontend.py

@@ -19,8 +19,6 @@
 
 
 class BridgeFrontend(object):
-    def __init__(self):
-        print "Bridge frontend initialization"
 
     def register(self, functionName, handler):
         raise NotImplementedError