Fix/auth

fix zauth error
czmq 2.0.3 has a small error and doesn't include platform.h:
http://permalink.gmane.org/gmane.network.zeromq.devel/23025

This change fix it by patching zauth.c and zsockopt.c as described in
the mailing-list post above. fix #4

This PR also include the changes from #10 fixing the poller test.

All tests pass.