Imap wrapper
Class Imap is only a wrapper now.
Server is ready to working with imap wrapper.
Added new methods to Imap wrapper.
Message is now ready to working with wrapper.
Attachment is now ready to working with wrapper.
New method Server::getFlags()
Added a simple construct test.
New method Server::getFlags()
Simple tests.
Merge branch 'feature/mock-imap' into develop