cleanup README and make language up-to-date
Merge pull request #431 from basho/zl-update-readme-to-2.0.2

update-readme-to-up-to-date-riak-version

Reviewed-by: javajolt
Merge remote-tracking branch 'origin/develop' into zl-merge-dev-into-2.0-for-test-readme-updates
Merge pull request #432 from basho/zl-merge-dev-into-2.0-for-test-readme-updates

merge dev into 2.0 for test readme updates

Reviewed-by: javajolt
Introduce exometer metrics into 2.0