Make duplicator usage in zring consistent with use in zhash
Merge pull request #709 from Q-Leap-Networks/pull-consistent-duplicators

Make duplicator usage in zring consistent with use in zhash
zpubsub in labs area compiles to object files.
zpubsub examples build with zpubsub from labs area.
Merge pull request #711 from lovmoen/master

zpubsub in labs area compiles to object files.
Problem: Cumbersome to compile z* files in labs folder

Solution: Changed the autotools configuration

Prerequisites: libczmq is installed

Step 1: ./configure --enable-labs=yes
Step 2: make
Step 3: make install

Know you've got a library libczmq_labs installed on your system which
can be used in third party projects.
Merge pull request #713 from sappo/master

Problem: Cumbersome to compile z* files in labs folder
Problem: There's no example on how to use labs library

Solution:

* modify the zpubsub simple example to link against labs library.
* update the README.txt with Step by Step setup.
Merge pull request #714 from sappo/master

Problem: There's no example on how to use labs library
Problem: No consistent code format.

Solution: Use uncrustify code formatter.
Merge pull request #715 from sappo/master

Problem: No consistent code format.
Revert "Problem: No consistent code format."
Merge pull request #716 from zeromq/revert-715-master

Revert "Problem: No consistent code format."
Problem: No consistent code formatting.

Solution: Use uncrustify code formatter.

Known Issues:

* No automatic removal of braces on one-line if, for and while
  statements as they may be confused for multi-line macros.
* Line break at 120 characters as 90 or 100 characters caused weired
  line break which cannot be reverted with uncrustify.
Merge pull request #717 from sappo/master

Problem: No consistent code formatting.
Fixed Makefile for zpubsub protobuf example to use czmq_labs library.
Added some .gitignores for labs directory.
Merge pull request #718 from lovmoen/master

zpubsub protobuf example is not built using czmq_labs library.
Problem: New contributer don't know about best practices and automatic code
formatting.

Solution: Update the CONTRIBUTION.md to let them know.
Merge pull request #719 from sappo/master

Problem: New contributers don't know about best practices and automatic code formatting.
Problem: hashtagged issues aren't automatically hyperlinked in md files

Solution: hard link to issue #680
Problem: some folk seem to be hard of hearing

Solution: extend the Warnings section of CONTRIBUTING. It's sad we need
to do this yet it's clear we lose a lot of time and effort otherwise.