Test aria-required on checkbox collection input

[#780]
Test aria-required on collection radio button input.

[#780]
Test aria-required on collection select input.

[#780]
Test aria-required for datetime input.

[#780]
Test aria-required for hidden inputs.

[#780]
Test for aria-required on priority input.

[#780]
Include aria-required attribute on required fields.

[Closes #780]
Move aria-required option to html5 component.

[Finishes #780]
Merge pull request #781 from ckundo/780-aria-required

Include aria-required attribute on required fields