Remove ARIA 4 and ARIA5

We should remove ARIA4 and ARIA5 because they are

- too ambiguous for both authors and auditors
- technically incorrect

## Too ambiguous

Both techniques don't provide helpful information for authors and auditors considering that WAI-ARIA Rec. contains limited examples. We should provide more specific techniques like design patterns of  WAi-ARIA Authoring Practices.

http://www.w3.org/TR/wai-aria/
http://www.w3.org/WAI/PF/aria-practices/

## Technical correctness

For ARIA 4, people who use assistive technologies may unable to operate user interface components when
- states and properties are not correctly exposed
- focus is not correctly managed (ex. "application" role in a page which doesn't contain JavaScript)

For ARIA 5, people who use assistive technologies may unable to operate user interface components when
- roles are not correctly exposed
- focus is not correctly managed (ex. "aria-activedecendant" in a page which doesn't contain JavaScript)

We could add failure example like "incorrect roles are exposed" or "incorrect states or properties are exposed" but I don't think they are necessary.