Prepared for release 3.2.1
Merge pull request #434 from vaughan0/master

Small documentation error I noticed
Fixed issue #443
Merge pull request #435 from hintjens/master

Added ZMQ_XPUB_VERBOSE option
Renamed ZMQ_ROUTER_BEHAVIOR to ZMQ_ROUTER_MANDATORY for clarity
Merge pull request #436 from hintjens/master

Renamed ZMQ_ROUTER_BEHAVIOR to ZMQ_ROUTER_MANDATORY
commented out TOS related opt for PGM
explicit comments on multicast loopback
fixed trailing whitespace
Merge pull request #437 from rohanbedarkar/master

Explicit comments
added artificacts for windows and openpgm build
Update CMakeLists.txt

Removed check for COPYING.txt
Minor refactor of CMake build script.
Make OpenPGM a CMake option, default disabled.
Detect ZeroMQ version at build time; hide NSIS dependencies in new cmake folder.
Add metadata to CMake options; mark executables advanced to hide from default view; fix WoW64 redirections.
Detect compiler version to tag libraries.
MSVC11 not getting defined in CMake 2.8.9, punt to version string.
Enable parallel make and LTO by default.
Update AsciiDoc version details with CMake detected ZeroMQ version.