static RangeRandom of(final Sampler lengthSampler) {
			return of(lengthSampler, Sampler.UNIFORM);
		}
Create a new random range generator, which uses the given distributions
for creating the shift points. The shift indexes are uniformly
distributed.

@see #of(Sampler, Sampler)

@param lengthSampler the sampler used for creating the shifted gene
       count
@return a new random shift generator with the given parameters
jenetics/src/main/java/io/jenetics/ShuffleMutator.java