Added envelopeTo and envelopeFrom support
Removed extra comma
Moved envelope extraction to "finalizeMessage"
Store envelope from & to before message is processed

The connection.from and connection.to fields get lost somewhere during
the mail parsing process, so they need to be stored right when we get
the dataReady event.
Merged upstream
Added envelope to expected data in tests
Made spamScore check depended on spamassassin being installed
Merge pull request #7 from inxilpro/master

Add 'envelopeFrom' and 'envelopeTo' fields to parsedEmail