Add support for most common nested elements in block quotes#49

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rmecham wants to merge 5 commits intoJohnSundell:masterfrom

Commits on Apr 20, 2020

Updated the blockquote parser to properly handle multiple paragraphs.
rmecham
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Commits on Apr 23, 2020

Commits on Apr 27, 2020

Added support for nested block quotes.
rmecham
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Commits on Apr 28, 2020

Cleaned up the implementation of ignore prefix.
rmecham
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