Directory Transferring

The main thing in this version is directory transferring, i.e. you can download and upload directories now, but only if it contains nonempty file (filesize greater than 0).
This feature also entailed lots of changes in queue and whole transferring system.
It means that there's possibility that you can expirience some troubles using this extension. And if you have troubles - please feel free to tweet me @Equals182 and create a new issue.