Standardise radio buttons and check boxes

• Bump gemfile to latest toolkit version
• include toolkit js for buttons
• add necessary class

Styles can be found in static in this pull request
https://github.com/alphagov/static/pull/442

https://www.agileplannerapp.com/boards/105200/cards/5197
update gemfile to latest toolkit version
Remove radio button js and move to static to be shared across repos
Merge pull request #96 from alphagov/standardise-radiobuttons-checkboxes

Standardise radiobuttons checkboxes