Merge pull request #643 from hintjens/master

Reverting zlist changes, other cleanups
Merge pull request #644 from hintjens/master

Adding keyed access to zring API
Merge pull request #645 from hintjens/master

Problem: zcertstore uses clumsy mix of hash + list
Problem: zproto_server animate -> verbose

Solution: fix zgossip to use same style.
Minor documentation fix
Whitespace fixes.
Updated man pages and README
Fixed verbose logging