[SpeedGrader] SpeedGrader should open pdfs in DocViewer for New Quizzes

[latecki]

When students submit their work as pdf documents for quizzes, then the instructor need to download the pdfs for grading. When students submit their work as pdf documents for assignments, then DocViewer will open them for grading and commenting, which makes grading easier. I just want the same feature for quizzes.

Hence please add the following functionality:

SpeedGreader should open pdfs in DocViewer for grading quizzes.