CLC-4043: Update gems: rails-perftest / active_attr / bootstrap / pikaday / momentjs / headless
https://jira.ets.berkeley.edu/jira/browse/CLC-4043
Merge pull request #2760 from christianv/CLC-4043

CLC-4043: Update gems: rails-perftest / active_attr / bootstrap / pikaday / momentjs / headless