Renaming recipient and sender. Issue #3
Remove nullable attributes. Issue #6
Moving all references to the end of the spec. Issue #7
Renaming deleteall to clear. Issue #8
Message ID uniqueness description. Issue #10
change smil property from Document to DOMString. Issue #12
normatively referencing content-ID and Content-Location. closes #15
making MessageEvent.message a union. closes #16
consistent use of ID. closes #17 and #21
Merge pull request #22 from efullea/gh-pages

Fixing several issues identified in the Madrid meeting