Merge pull request #72 from hintjens/master

Resolve issue #939
Merge pull request #74 from mditzel/master

Fix #73: link error when cross-compiling with mingw.
Fixed link error when cross-compiling with mingw.
Fix issue #75
Merge branch 'master' of https://github.com/zeromq/zeromq4-x
Merge branch 'master' of https://github.com/zeromq/zeromq4-x
Merge branch 'master' of https://github.com/mditzel/zeromq4-x
Merge pull request #76 from mditzel/master

Fix issue #75
Updated NEWS