[CLC-1531] Celluloid and nokogiri updates
Merge pull request #1164 from raydavis/raywip

NOJIRA Make Canvas proxy error logging more useful
CLC-1781 - Datepicker - fix tabindex + border focus
https://jira.media.berkeley.edu/jira/browse/CLC-1781
Merge pull request #1166 from christianv/CLC-1781b

CLC-1781 - Datepicker - fix tabindex + border focus
Merge pull request #1163 from yuhunglin/CLC-1531

[CLC-1531] Celluloid and Nokogiri updates
CLC-1523 - Front-end - Activities - implement dropdown
https://jira.media.berkeley.edu/jira/browse/CLC-1523
Merge pull request #1167 from christianv/CLC-1523

CLC-1523 - Front-end - Activities - implement dropdown
CANVAS-114 Refresh Canvas section memberships WORK IN PROGRESS