Changed kitten data to be more robust
Fixed response set to use latest kitten data object
Added migration to update existing kitten data
Added tests for kitten data model, minor refactor to kitten data model
Merge branch 'master' of github.com:theodi/open-data-certificate into kitten-data-improvements

Conflicts:
	db/schema.rb
Merge pull request #565 from theodi/kitten-data-improvements

Kitten data improvements