SI: Set 'Accept' header to the integrity metadata's content type. (bug #6)
Merge pull request #8 from w3c/issue6

SI: Set 'Accept' header to the integrity metadata's content type. (bug #6)
Added language about GUID URI schemes.
Merge pull request #10 from hillbrad/guidURISchemeText

Added language about GUID URI schemes.
SI: Prepping FPWD.