Changelog for mwc-random-

Changes in * createSystemRandom added Changes in * Workaround for GHC bug 8072 (bug 25). GHC 7.6 on 32-bit platrofms is affected. * Generators for truncated exponential and geometric distributions added. Changes in * Fucntion `asGenIO' and `asGenST' added. * Generation of discrete random variates using condensed tables methed. Tables for Poisson and binomial distributions are provided.