add key derivation function to public interface
add key derivation function to public interface

meejah/AutobahnPython,leedm777/AutobahnPython,schoonc/AutobahnPython,Jenselme/AutobahnPython,jvdm/AutobahnPython,dash-dash/AutobahnPython,D3f0/AutobahnPython,wrapp/AutobahnPython,crossbario/autobahn-python,crossbario/autobahn-python,tomwire/AutobahnPython,boonedox/AutobahnPython,iffy/AutobahnPython,tavendo/AutobahnPython,ttimon7/AutobahnPython,wrapp/AutobahnPython,mcfletch/AutobahnPython,oberstet/autobahn-python,luhn/AutobahnPython,flyser/AutobahnPython,claws/AutobahnPython,dash-dash/AutobahnPython,markope/AutobahnPython,claws/AutobahnPython,nucular/AutobahnPython,mcfletch/AutobahnPython,dash-dash/AutobahnPython,leedm777/AutobahnPython,leedm777/AutobahnPython,boonedox/AutobahnPython,oberstet/autobahn-python,iffy/AutobahnPython,hzruandd/AutobahnPython,crossbario/autobahn-python,flyser/AutobahnPython,flyser/AutobahnPython,bencharb/AutobahnPython,boonedox/AutobahnPython,RyanHope/AutobahnPython,oberstet/autobahn-python,inirudebwoy/AutobahnPython,wrapp/AutobahnPython,D3f0/AutobahnPython,dash-dash/AutobahnPython,Geoion/AutobahnPython,iffy/AutobahnPython,D3f0/AutobahnPython,iffy/AutobahnPython