Add a check for directory type when checking signatures. We still dont validate multisigned directory identies right.
Add a check for directory type when checking signatures. We still dont validate multisigned directory identies right.

reezer/mixminion,nmathewson/mixminion,Javex/mixminion,rxcomm/mixminion,Javex/mixminion,Javex/mixminion,crooks/mixminion,Javex/mixminion,mixminion/mixminion,nmathewson/mixminion,crooks/mixminion,rxcomm/mixminion,rxcomm/mixminion,nmathewson/mixminion,crooks/mixminion,crooks/mixminion,mixminion/mixminion,rxcomm/mixminion,reezer/mixminion,reezer/mixminion,mixminion/mixminion,reezer/mixminion,mixminion/mixminion,nmathewson/mixminion