load scores faster on grades page
load scores faster on grades page

test plan:
 * navigate to the /grades page as:
  - a student enrolled in at least 2 courses
  - an observer observing at least 2 students
    in different courses
  - a teacher teaching at least 2 courses
 * verify the page loads in the cases
   listed above

Change-Id: Ic08e810034da89d7c2ecb4299a72ccbabdd26e64
Reviewed-on: https://gerrit.instructure.com/67652
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Tested-by: Jenkins
QA-Review: Derek Hansen <cb1116771307a93b98b6babf698410ed3846296d@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

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