Includes cmark markdown parser library.

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+# Benchmarks
+
+Here are some benchmarks, run on an ancient Thinkpad running Intel
+Core 2 Duo at 2GHz.  The input text is a 11MB Markdown file built by
+concatenating the Markdown sources of all the localizations of the
+first edition of
+[*Pro Git*](https://github.com/progit/progit/tree/master/en) by Scott
+Chacon.
+
+|Implementation     |  Time (sec)|
+|-------------------|-----------:|
+| Markdown.pl       | 2921.24    |
+| Python markdown   |  291.25    |
+| PHP markdown      |   20.82    |
+| kramdown          |   17.32    |
+| cheapskate        |    8.24    |
+| peg-markdown      |    5.45    |
+| parsedown         |    5.06    |
+| **commonmark.js** |    2.09    |
+| marked            |    1.99    |
+| discount          |    1.85    |
+| **cmark**         |    0.29    |
+| hoedown           |    0.21    |
+
+To run these benchmarks, use `make bench PROG=/path/to/program`.
+
+`time` is used to measure execution speed.  The reported
+time is the *difference* between the time to run the program
+with the benchmark input and the time to run it with no input.
+(This procedure ensures that implementations in dynamic languages are
+not penalized by startup time.) A median of ten runs is taken.  The
+process is reniced to a high priority so that the system doesn't
+interrupt runs.