MarkUsProject/Markus — pull request #1670 by zhangsu (2014-08-09 01:48:11+00:00)
Title: Avoid n+1 queries in marks_graders view

This mainly improves the performance of the index page of assigning graders to spreadsheet students. There are also some minor refactoring.

Tested:
- rspec
- rake test:units
- rakte test:functionals
- local server