Use the latest kuma-lib.
Add switch for enabling or disabling Optimizely

This will allow us to disable the Optimizely include when we are not
actively running experiments.
Merge pull request #2561 from openjck/optimizely-waffle-switch

Add switch for enabling or disabling Optimizely
Restore .errorlist styles
Merge pull request #2558 from openjck/restore-errorlist-styles

Restore .errorlist styles