Peglet

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* Fixed Unicode-escape parsing in the JSON example.

* Added an infix parsing example.

* Made the regex parsing example do something useful: generate strings
that match the regex.

* Tweaked code and documentation.

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Initial release.

See https://github.com/darius/sketchbook/tree/master/parsing
for some early sketches.

See http://www.udacity.com/wiki/CS212%20Unit%203%20Code?course=cs212grammarpy
and http://www.inf.puc-rio.br/~roberto/lpeg/ for some influences.

Thanks to Kragen Sitaker for ideas about the syntax.