Fix issue with HTML comments with empty line about multimarkdown-6 HOT 6 CLOSED

To avoid backtracking, I suspect the only way to handle this involves two options:

1. Leave as is and treat comments like other HTML markup. This requires leaving out blank lines.

2. Treat HTML comments like fenced code blocks -- once opened, you either close them, or they continue through the end of the document. (This is the approach used by CommonMark)

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So at least this is partially comparable to #41?

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@mn4367 -- Yes... It's basically the same problem, complicated by the fact that CriticMarkup is, by definition, "orthogonal" to Markdown.

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The other thing to note -- comments are treated like other HTML spans in that they can either start at the beginning of a line (HTML "Block") or inside a line (HTML "Span").

An HTML Span is parsed inside of another block (e.g. a paragraph) and must therefore be completed inside the paragraph.

An HTML Block is its own block, so can contain empty lines.

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I pushed a commit to the development branch to address this. If the <!-- or --> are on lines by themselves, they can start or stop a comment block. Otherwise, they must be part of another block (e.g. a paragraph).

The test suite has some (updated) examples to clarify this, particularly HTML Comments.

I also fixed an issue with non-HTML outputs where some HTML comments would leak through but others would not. For now, HTML comments are limited to HTML only. I want to work on this further in issue #38.

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