Add fancy list plugin.

[tannewt]

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This is ported from https://github.com/Moxio/markdown-it-fancy-lists https://github.com/Moxio/markdown-it-fancy-lists/commit/f47a6c2b63d9ce4b82882a59302b24abc0328032

Fixes #34

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[chrisjsewell]

Fancy! Cheers will try to have a look in next few days