Bumped version
- Removed the old experiment code
- Moved the tracking codes to a centralised point
- Added another tracking code for drop down links
Merge pull request #201 from ministryofjustice/tracking-codes

Tracking codes reshuffle
Fixing jenkins tests
We're tracking the difference between server time and client time - FOR SCIENCE!
This info ends up in Google Analytics.
Merge pull request #202 from ministryofjustice/clock-skew-tracking

We're tracking the difference between server time and client time - FOR ...
Completed missing changelog information
Bumped version
Merge branch 'release/2.20.0'