Update mappings for address element #170

This issue is to track the removal of the address's unique properties to expose "address" to the different platform's accessibility APIs. These do not appear to have been presently implemented, nor seem to be necessary.

Instead, while address may be used as a semantic HTML element, it should not provide any special roles or announcements beyond that of a div, as the content of the element itself should be sufficient to indicate its purpose (an address / contact information).

Per ARIA's #872: Create address role, discussing with @stevefaulkner, doing some quick screen reader testing with the address element, and tweets.

To further keep track of issues / decisions per the mapping history of address, here are related issues:

• #166: Verify the IA2 mappings for the address element
• #164: The address element should map to ATK_ROLE_SECTION; not ATK_ROLE_PANEL
• #33: should address be treated as section/landmark in AAPIs?, relates to HTML-AAM: UIA mapping for address #32.

Additionally, a Webkit issue filed - "AX: Reconsider role for "address" tag".