Moved deleteMessage() to the Account class, because only the account knows where the real trash is (using the special use flags)
Fix deleteMessage() doc
Merge branch 'special-use-trash' of https://github.com/zinks-/owncloud-mail into zinks--special-use-trash

Conflicts:
	lib/mailbox.php
use Horde_Imap_Client_Mailbox on copy to trash
error logging added on delete message
search for trash folder by name in case we cannot get it based on the special use attribute
Merge pull request #306 from owncloud/zinks--special-use-trash

Zinks  special use trash