MATH-1020.
Fixed "nextPermutation" in "RandomDataGenerator". Bug showed up when using
a fixed version of "shuffle" (MATH-1019) added in "MathArrays" (MATH-1010).
Added overloaded "shuffle" method (used in the above fix).


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1512306 13f79535-47bb-0310-9956-ffa450edef68