Add Support for event content_uploaded in URKUND

Hi Dan,

In order to create file not as moodle storage file, I have to update the definition of get_file_results
which has its third paramtere as stored_file $file which I changed to just $file. In order to make it
compatible with get_file_results defined in plagiarism/lib.php I created the commit here -
https://github.com/kanikagoyal/moodle/commit/5f3d74b2094dba76691fa0bbb04f5400fdd3a738
Let me know if I am wrong, I will do the same in turnitin.

Thanks,
Kanika