using tr1's random in parallel/random_number.h

[Benjamin Kosnik]

I think we can use TR1 functionality for some or all of this file.
Here's a patch to use TR1's mersenne_twister. The next step would be
trying to replace __gnu_parallel::random_number with TR1 equivalents
and change usage.

Thoughts? The downside of this would be that tr1 random gets pulled in
to the headers. 

-benjamin
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