Swap all 'crypto/rand' rng in tests with 'math/rand'

[rht]

#143

[rht]

I wonder if NewTimeSeededRand should be renamed to explicitly show that it outputs bytes? Other than this, there are SeededRand and default math.rand for integers, and finally crypto/rand.

All math.rand should be replaced with SeededRand.

Should the list be: RandomBytes (NewTimeSeededRand), RandomIntegers (SeededRand), and crypto/rand?

[rht]

(adding one more commit to see if the go test fails again)

[rht]

Test is still not faster than expected standard deviation.

[jbenet]

hm. i think it makes the most difference in any keygen things -- there may also be other hardware based differences (diffs between systems where the os is serious about entropy collection or not)