fix several compiling issues occured with 2.3.3

Merge pull request #45 from freswa/master

Revert "fix compiling with 2.3.3"

Implement user lookup for alias mailboxes

There are people creating seperate mailboxes for aliases. Those have the original username set in an attribute. If a PN is triggered it would be send to the alias email which is no known by the xapsd. With this PR we allow to set the attribute from which the username can be read (optionally).

Add compatibility with macOS

v0.5

add another bunch of unused symbols

Implement handling of mailbox events

Merge pull request #31 from freswa/master

push mailbox events to the daemon

Prepare for notifications on flag changes and deletes

• use push-notification plugin instead of notify (which allows easy handling of more than just NewMessage events)
• use cmake instead of make
• code simplification and refactoring

v0.2

adds compatiblity with dovecot > 2.2
removes deprecated net_transmit function

v0.1

Update README.md