Revert "Remove redundant method"

This reverts commit f0e8f8bcd9ec04a3f9e7349eb3677d262d95b76a.
Test receiving correctly a prefetched message when using a poller
Merge pull request #226 from fredoboulo/req-prefetch

Message prefetch when polling on a REQ socket
Merge pull request #1 from zeromq/master

1st Pull