Log Message:
Update to mwc-random-0.15.0.1

Changes in 0.15.0.1
* Bug in generation of Int/Word in both uniform and uniformR is
  fixed. (#75)

Changes in 0.15.0.0
* withSystemRandomST and createSystemSeed are added.
* withSystemRandom is deprecated.
* random>=1.2 is dependency of mwc-random.
* Instances for type classes StatefulGen & FrozenGen defined in
  random-1.2 are added for Gen.
* Functions in System.Random.MWC.Distributions and
  System.Random.MWC.CondensedTable now work with arbitrary StatefulGen
* System.Random.MWC.uniformVector now works with arbitrary StatefulGen
  as well and uses in-place initialization instead of generateM. It
  should be faster for anything but IO and ST (those shoud remain
  same).