nutterts/randgen — pull request #1 by gregbillock (2013-09-28 20:45:42+00:00)
Title: Fix refill lower mask value to 0x7fffffff

See the original paper at http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/ARTICLES/mt.pdf -- value of LOWER_MASK in appendix C. Also the constants in http://en.wikipedia.org/wiki/Mersenne_twister#Algorithmic_detail