wide finder in ragel

[Adrian Thurston]

Hi, here is a completed version of the wide finder benchmark.

Summary: ragel + mmap + pthreads + std::map.

I don't have a multi-core machine to test on, but on a single core it
goes about 10x faster than the ruby version here:

http://www.tbray.org/ongoing/When/200x/2007/09/20/Wide-Finder

Adrian

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