Remove obsolete portions of test-registry.json; doesn't affect existing test results.

This resolves issue #13.
Update title on test 0001 to indicate that there is an itemtype, not no itemtype.
This addresses issue #14.
Last minute change before publication: changed the references to df11
Changed 'plain literals' to 'simple literals'
Update to provide definitions and usage for both _simple literals_ and _langauge-tagged strings_. Regenerate diff and Overview. This completes issue #16.
Fix broken Overview.
The final diff was not properly generated... added it
Update tests/index.html to better describe processing rules for input and result files in the same vein as RDF11-TESTCASES.
This addresses issue #19.
Remove vocab_expansion property for expansion tests, as it is no longer optional.
Add test 0071 to test schema:additionalType in published registry.
Update definition of _reverse properties_ to reference _the properties of an item_ replacing `@itemprop` with `@itemprop-reverse`.

This partially addresses concerns raised in issue #24.
Update top-level item definition to consider @itemprop-reverse.
Also for issue #24.
Clarify that the type of an item is the first value from `@itemtype` which is an abosolute URL.

This resolves issue #22.
Update ED document previous publish date and diff to latest version.