Grading center hack

http://oliva.uhk.cz/webapps/gradebook/do/instructor/getJSONData?course_id=_657_1

http://oliva.uhk.cz/webapps/gradebook/do/instructor/getGradeHistory?sortDir=ASCENDING&course_id=_657_1&numResults=100

http://stackoverflow.com/questions/2246901/how-can-i-use-jquery-in-greasemonkey-scripts-in-google-chrome

https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo