Speed taging: save, convert to draft and move on to next
Copy change on the button
Refactor NationalApplicability not to override update method

national_applicability.rb overrides the update method, changes this so
that the speed tagging changes to the editions controller update action
work.
Refactor js to not use the onclick handler
Merge pull request #145 from alphagov/speed-tagging-save-and-convert

Speed tagging save and convert to draft and progress to the next item