Revert "Add disconnect method"
Revert "Add disconnect method"

This reverts commit b2d63333608f2ec74d3b9854673eaf3f6fc01292.

zeromq/jeromq,fredoboulo/jeromq,fredoboulo/jeromq,trevorbernard/jeromq,zeromq/jeromq,c-rack/jeromq,trevorbernard/jeromq