Allow adding callbacks against multiple to states, and bump rubocop
Bump versions
Merge pull request #84 from gocardless/update-dependencies

Update dependencies
Add not-null conditions to generated statesman tables
Merge pull request #86 from gocardless/add-not-null-conditions

Add not-null conditions to generated statesman tables
Move multiple to states logic to Callback
README additions including FAQs and docs on testing
Tweaks to FactoryGirl stuff
Merge pull request #83 from gocardless/after-to-multiple

Allow adding callbacks against multiple to states, and bump rubocop
Merge pull request #88 from gocardless/readme

README Additions (FAQs and Testing)
Merge branch 'master' of https://github.com/gocardless/statesman