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
Problem: classes aren't respecting CLASS guidelines on _dup

Solution: fixed all _dup methods, also to handle out-of-mempory
correctly.
Problem: too hard to work with chunks that hold text data

Solution: add _strdup, _strhex, _streq methods as provided in zframe.
Problem: could use more help to track down socket leaks

Since CZMQ v3 no longer closes sockets automatically, especially when
we bind into other languages, socket leaks can be painful to diagnose.

Solution: add socket type to printed error message; it's easier to
fix a leak when we know whether it's a PAIR, ROUTER, etc.
Merge pull request #646 from hintjens/master

Mostly, tracking zproto's changes