v1.4.0

ZMQ v1.4.0

Diff since v1.3.0

Merged pull requests:

• Add the Message(::DenseVector) constructor back to the docs (#250) (@JamesWrigley)
• Use [sources] for the docs project (#252) (@JamesWrigley)
• Implement send_multipart() and recv_multipart() (#253) (@JamesWrigley)

Closed issues:

• Odd REQ->recv Socket Performance (#53)
• documentation about sending different messaging formats (#74)
• Stable documentation is out of date (#249)
• Missing source file for ZMQ (#251)