Fixing typo.
Adding KeyRange utility functions.

Also checking upon tablet creation that Start < End.
Another couple fixes to zkocc test.
Populating, validating KeyRange on tablet create.
Refactoring shard creation code.
Now resolving zk hosts before sending them to zk.

That way we can skip the ones that don't resolve, instead
of having the library fail for them.
Update README.markdown
remove references to BinLogIndexPath from configs