update README
Merge pull request #381 from basho/jrw-readme-updates

update README
Merge branch 'feature/sdc-datatypes' of github.com:basho/riak_test into feature/sdc-datatypes
Add config changes to speed handoff after heal

Set handoff concurrency higher and tick time lower so handoff
happens sooner.

Changed req params on final check to ensure we get a converged value
as soon as possible.