Fixed subject and educational stages update error. Added 404 return for inexistent ids in package controller.

Removed URLs from thumbnail generator. Removed learning object description from bitstream. Calling chmod on uploaded file.

Fixed temp download file permissions. Fixed learning object importer link. Fixed dspace upload mimetype nil exception

Ensuring the databse connections are cleared once workers are done. Redirecting download to uploaded files while DSpace upload is not finished.

Removing requisition of "complaint" from parameters in the rejection or acceptance of the complaints.