We look for "Version: 1" anywhere in the payload, as opposed to an exact match with it.

This allows arcane-maildir -d to work properly in a few cases where there is garbage around the version string, avoiding errors similar to this:

igorhvr:~/ $ /home/igorhvr/idm/arcane/arcane-maildir -k igorhvr -m ~/INBOX.test/INBOX -d
GPG Passphrase:
Root Maildir:
XXXXXXXXXXXXXXXXXXXXXXXCouldn't decrypt message, wrong  PGP Version information
Traceback (most recent call last):
  File "/home/igorhvr/idm/arcane/arcane-maildir", line 90, in <module>
    sys.exit(main())
  File "/home/igorhvr/idm/arcane/arcane-maildir", line 65, in main
    handle_maildir(ns,src_mbox)
  File "/home/igorhvr/idm/arcane/arcane-maildir", line 81, in handle_maildir
    mail = GPGDecryption().decryptPGP(mail,crypto_ns.key[0],crypto_ns.gpg_passphrase)
  File "/home/igorhvr/idm/arcane/gpg.py", line 129, in decryptPGP
    except Gpgme.error as err:
NameError: global name 'Gpgme' is not defined
Fix maildir parameter reference to what comes from argparse.ArgumentParser when iterating over a mailbox.

This avoids the following error:

igorhvr:arcane/ $ /home/igorhvr/idm/arcane/arcane-maildir -k igorhvr -m ~/INBOX.test/INBOX -d
GPG Passphrase:
Traceback (most recent call last):
  File "/home/igorhvr/idm/arcane/arcane-maildir", line 90, in <module>
    sys.exit(main())
  File "/home/igorhvr/idm/arcane/arcane-maildir", line 62, in main
    src_mbox = mailbox.Maildir(maildir, factory=mailbox.MaildirMessage)
NameError: global name 'maildir' is not defined
Merge pull request #1 from igorhvr/master

Misc fixes.