Change const to var.
Accept flag to build for ZMQ 2.1
Merge pull request #29 from tuxychandru/master

ZMQ 2.1 compatibility with build flag
Fixes Issuq #27
Added Version Info
Merge pull request #31 from MaStr/master

Added Version Info
Add preliminary support for ZeroMQ 3.x.

No extra functionality has been added, but the bindings should compile
and work.
Merge pull request #33 from somia/master

Fix for bug with SetSockOpt*, where wrong value size can be passed through to the C function.
README - "error: 'ZMQ_FOO' undeclared"
Merge pull request #36 from soniah/master

README - "error: 'ZMQ_FOO' undeclared"
Fix 3.x migration bug with zmq_msg_recv return value.

Fixes #39.
Fix 3.x migration bug with zmq_sendmsg return value.
Merge pull request #40 from jtacoma/fix-sendmsg

Fix 3.x migration bug with zmq_sendmsg return value.
proxy device was added
test for proxy device was added
Merge pull request #44 from lorehov/master

Proxy device+tests added. Thanks to @lorehov.
Switch to .md and godocdown.
Moved docs into .godocdown.md.
Link to zguide examples.
Add reference to godocdown.
examples: Makefile -> go tool chain: removing Makefile, putting client and server in separate directories