uploading with <input type=file>-button  works, but links are not inserted in document and toolbar-button for uploading is not working yet
tested html purifier runtime vs formatReady runtime
tested html purifier runtime vs formatReady runtime
added upload button; code not complete yet...
name of uploaded file is now utf-8 encoded before json_encode is called
writing returned file name of uploaded file to console.log
upload by jquer-file-upload now working, but links are not yet inserted
upload previously worked only the first time, now handling seems to be correct :-)
upload url is now configurable
added link to jquery file upload
changed response of file upload handler as recommended by jquery file upload plugin
jquery upload plugin now uses only a single upload request instead of multiple requests at once
removed unneded files
studip-upload plugin now correctly inserts files into document
drag'n'drop is now handled by studip-upload ckeditor plugin; but currently implementation depends on specific richtext-editor implementation; see #90