append optimizely js onload of article
wrap optimizely in switch
Merge pull request #575 from guardian/dev-error-tracking

On DEV, output error to console (rather than pixel tracking)
Merge pull request #584 from guardian/dev-error-tracking

Jshint fixes
use require to pull in optimizely
accidentally deleted switch check; back in
Merge pull request #583 from guardian/optimizely

SI MERGO! Adding optimizely js
Call correct method to delete fonts
Merge pull request #586 from guardian/font-fix

Call correct method to delete fonts