Fixed docstring
Introduced ng-form to group widgets MultipleCheckbox into field reacting for ng's form validation
Separated forms and rmi into two files
fixed: directive input can be uglified
input elements grouped together are handled correctly
Simplified the way to build the TupleErrorList
traveling field required
Code cleanup
Validation tick is added to bound field in pristine mode
By using intrinsic CSS classes, styles could be simplified
Added extra button to submit invalid forms
Fixed validation problems for widgets groups of type CheckboxSelectMultiple