Moved header address parser into mailutils.py, added tests, improved
Add key support to AddressHeaderParser, improved API of AddressInfo
Fix reply header generation (issue #618)
Make BCCing self optional (issue #618)
Fix encoding issues, respect noreply@ signals (issue #618)
 Enhanced plugin loading for external plugins.

 New manifest.json features are:
 - startup and shutdown hooks
 - register mailboxes
 - pass config to mailbox parse_path
 - Added usage examples to demos plugin

 Necessary enhancements for external LEAP plugin.
Fixed tests in test_search.py.
Minor bugfixes, API cleanup (issues #618, #383)
Merge pull request #651 from codeburg/leap

 Enhanced plugin loading for external plugins.
Allow for automatic appending of signatures, fixing #91 (but still needing UI for creating signature)
1st draft of message templates/signatures, allow template MID as a compose/reply/fwd arg