Create branch for 2.x releases.

--HG--
branch : r2.x
Merge default branch.

--HG--
branch : r2.x
Adding selection tests.

--HG--
branch : r2.0.2
Adding selection tests.

--HG--
branch : r2.0.2
Relaxe precondition of TournamentSelector. It now conforms to the general Selector contract.

--HG--
branch : r2.0.2
Handle special case population.size() == 1, when calculating the selection probabilities.

--HG--
branch : r2.0.2
Fix StochasticUniversalSelector selection: https://bitbucket.org/fwilhelm/jenetics/issue/5

--HG--
branch : r2.0.2
Fix selectors and additional selector tests.

--HG--
branch : r2.0.2
Update Apache Commons Math version.

--HG--
branch : r2.0.2
Fix minimizing of Probability selector.

--HG--
branch : r2.0.2
Add javadoc.

--HG--
branch : r2.0.2
Some code reformatting.

--HG--
branch : r2.0.2
Update external library version in readme file.

--HG--
branch : r2.0.2
Update changelog.

--HG--
branch : r2.0.2
Update changelog.

--HG--
branch : r2.0.2
Fix type in javadoc.

--HG--
branch : r2.0.2
Update version in README.md file.

--HG--
branch : r2.0.2
Update version string.

--HG--
branch : r2.0.2
Update version strings.

--HG--
branch : r2.0.2
Remove link to javolution for Javadoc generation.

--HG--
branch : r2.0.2