Check for tiers on assignment show
Allow instructors to turn off timeline feature, redirect students to syllabus tab and instructors to top 10
Merge pull request #756 from UM-USElab/rubric-updates-2

Rubric updates 2
Merge pull request #757 from UM-USElab/timeline-optional

Allow instructors to turn off timeline feature, redirect students to syl...
Updated rollbar and new relic
Merge pull request #758 from UM-USElab/gem-updates

Updated rollbar and new relic