Add new replaceContents method to Lockfile so that the pidfile can change its contents after locking and forking.
Add new replaceContents method to Lockfile so that the pidfile can change its contents after locking and forking.

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