created working cmake build for czmq
missing CZMQ_EXPORT for two unit tests
added msvc support for cmake build
added CZMQ_EXPORT to the gsl source
Moved the CMakeLists.txt work into build-cmake.gsl.

The build-cmake.gsl now contains all the new CMake build smarts,
and has GSL rules to explicitly generate the sources and headers list.
The checked in CMakeLists.txt is now generated from build-cmake.gsl.
Merge pull request #380 from guruofquality/cmake_work

created working cmake build for czmq
Fix memory leaks
Merge pull request #382 from HughPowell/master

Fix memory leaks
Fix zlist_dup
Merge pull request #383 from HughPowell/master

Fix zlist_dup
Add zlist_freefn
Merge pull request #384 from HughPowell/master

Add zlist_freefn
Added CZMQ bindings
Fixed issue #377
Added zsocket_sendmem back to API
Improved zauth verbose output
Fix typo in comment
Merge pull request #386 from hurtonm/master

Fix typo in comment
Fixed issue #385
Merge pull request #378 from hintjens/master

Fixed issue #377