Added "production office" and operating system to omniture.

This did modify the content api query which caused a data refresh.
Merge branch 'master' of github.com:guardian/frontend into omniture-updates
An abstraction too far maybe
Merge branch 'master' of github.com:guardian/frontend into omniture-updates
Added page load speed to Omniture analytics
Merge pull request #4933 from guardian/omniture-updates

Added "production office" and operating system to omniture.