Merge 'default' branch.

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branch : r1.2.0
Prepare Selectors for parallelization.

--HG--
branch : r1.2.0
Prepare Selectors for parallelization.

--HG--
branch : r1.2.0
Update change.log.

--HG--
branch : r1.2.0
Improve javadoc.

--HG--
branch : r1.2.0
Update version string.

--HG--
branch : r1.2.0
Implement parallel versio of 'Population.fill' method.

--HG--
branch : r1.2.0
Update javadoc.

--HG--
branch : r1.2.0
Improve parallelism of 'GeneticAlgorithm' class.

--HG--
branch : r1.2.0
Code formatting.

--HG--
branch : r1.2.0