release_3155

All PRs included

#2423 National Minimum Wage 1 April 2016
#2412 Allow RatesQuery date to be set using environment variable
#2418 Use auto generated Rubocop config
#2417 Add a missing link to a referenced commit
#2416 Add links to the example commits referenced in the instructions.
#2415 Update dev vm instructions

PRs to check post-deployment

#2423 National Minimum Wage 1 April 2016