Wording tweaks around Role.
Marking musicGroupMember as supercededBy member.
Merged in Jason Johnson's text for namedPosition.
Updated OrganizationRole with Jason Johnson's better definition text.
Replaced a test that mistakenly asserted that suggestedAnswer had a superproperty.
per https://help.github.com/articles/dealing-with-line-endings
Line endings global fix.

Also tweaked TheatreEvent example.
A namedPosition can take an URL, e.g. controlled vocabulary.