2.5.0 add emailJS mime parser and extended public keys

Please note that while the feature list below is small for this release, a lot of code was added/changed. This Zimlet now includes a full mime implementation for reading pgp/mime and as such should support reading email from any client (including apple mail). And this should be a great improvement.

• Implement new mimeparser by emailJS to do all pgp/mime mime parsing
• Allow armored blocks with multiple keys in the ldap fields and addressbook notes field (except for public key 1)
  allowing for easy import from enigmail see http://barrydegraaff.github.io/help/#thunderbird-enigmail-export