Changes for https://github.com/mozilla/rust/issues/2379#2415

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Dretch wants to merge 3 commits intorust-lang:masterfrom

Dretch:rngchanges

Commits on May 20, 2012

separate the rand::rng gen_* methods out into an iface-less-impl so that the gen_* methods can be reused with different rng implementations (for https://github.com/mozilla/rust/issues/2379)
Dretch
committed
add a bunch more rand::rng extension methods - one for each primitive type and also some choose/shuffle functions (for https://github.com/mozilla/rust/issues/2379)
Dretch
committed
add a seeded random number generator so that sequences of random numbers can be easily reproduced (for https://github.com/mozilla/rust/issues/2379)
Dretch
committed