Put Gradebook button on Grading page

[sahi1l]

Feature Request Please put a copy of the "Gradebook" button on the Grading tab in the Instructor's View. Don't remove it from Student Progress, though.

Why?

1. I keep looking in the "Grading" tab for it.
2. Once the autograder is done running, I usually want to look at the grades right away. Having a button there would help.