New listener for transmitting messages between an uploader and the core.
New state UPLOADING has been added.
Created skeleton of the class for running uploads in a new thread.
Preparement for publishing in a new thread.
New icon (to be displayed when upload is running).
Added new ContentPublisher for testing purposes (contains a delay).
Support for multithreaded uploading (solves #4).
Updated JAR file.
Updated documentation.
Merge pull request #9 from tzima/multithreaded-upload-devel

Merging multithreaded-upload-devel into master (solves #4)