NOJIRA - Add imageoptim to the styleguide.
Merge pull request #2110 from christianv/imageoptim

NOJIRA - Add imageoptim to the styleguide.
CLC-3194 Use pundit to authorize cache clearing
CLC-3194 pundit authorization for CanvasUserProvisionController
CLC-3194 pundit auth for MyCampusLinksController
CLC-3194 pundit auth for MyEventsController
CLC-3194 pundit auth for RefreshLoggingController
CLC-3194 pundit auth for RoutesListController