Bug 591467 - Implement HTML5 Microdata API r=bz

content/base/src/nsDOMLists.h

content/base/src/nsDOMSettableTokenList.h

content/base/src/nsDOMTokenList.h

content/base/src/nsGenericElement.cpp

content/base/src/nsGkAtomList.h

content/html/content/public/nsHTMLAudioElement.h

content/html/content/public/nsHTMLVideoElement.h

content/html/content/src/HTMLPropertiesCollection.cpp

content/html/content/src/HTMLPropertiesCollection.h

content/html/content/src/Makefile.in

content/html/content/src/nsGenericHTMLElement.cpp

content/html/content/src/nsGenericHTMLElement.h

content/html/content/src/nsHTMLAnchorElement.cpp

content/html/content/src/nsHTMLAreaElement.cpp

content/html/content/src/nsHTMLAudioElement.cpp

content/html/content/src/nsHTMLIFrameElement.cpp

content/html/content/src/nsHTMLImageElement.cpp

content/html/content/src/nsHTMLImageElement.h

content/html/content/src/nsHTMLLinkElement.cpp

content/html/content/src/nsHTMLMetaElement.cpp