better warnings for CDATA, processing instructions used in HTML

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="96" height="96"hspace="10"> Issue by sethladd Originally opened as dart-lang/sdk#16696

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they're warnings in html, but it would be good to explain this :) look for bogusCommentState in the tokenizer. More info here: http://wiki.whatwg.org/wiki/HTML_vs._XHTML

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Was https://github.com/dart-lang/html5lib-now-on-dart.googlecode.com/issues/48

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Added Pkg-Html5Lib label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Removed Library-Html5lib label.