Graph
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 Remove `flexi-streams` dep, add more error checkingSat, 10 Feb 2018 16:47:39 -0500, by Steve Losh
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 Implement peekable streams ourselves in the quest for zerodepsSat, 03 Feb 2018 15:43:03 -0500, by Steve Losh
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 Use 0 for black in pbm imagesSat, 27 Jan 2018 13:08:36 -0500, by Steve Losh
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 Add a basic test suiteThu, 25 Jan 2018 23:14:41 -0500, by Steve Losh
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 Export API functionsMon, 22 Jan 2018 18:35:39 -0500, by Steve Losh