fix #27 thread tests hang on Ubuntu

Uninitialize member data roulette
Remove diagnostic output from last commit
Merge pull request #28 from rodgert/master

fix #27 thread tests hang on Ubuntu
Merge pull request #29 from oliora/master

Bug fixes
Make socket extension mechanism private detail

See discussion of https://github.com/zeromq/azmq/pull/12
Merge remote-tracking branch 'upstream/master'

Conflicts:
	azmq/detail/socket_service.hpp
Merge pull request #30 from rodgert/master

Make socket extension mechanism private detail
Merge pull request #1 from zeromq/master

update from origin