Add zeromq perf test. Cleanup files.
	new file:   Makefile.inc
	modified:   echotestlib/echotestlib.h
	modified:   epoll/Makefile
	modified:   epoll/epollserver.cpp
	modified:   kqueue/Makefile
	modified:   kqueue/kqueueserver.cpp
	modified:   libevent/Makefile
	modified:   libevent/eventserver.cpp
	modified:   memcpy/Makefile
	modified:   memcpy/memcpyserver.cpp
	modified:   mmap/Makefile
	modified:   mmap/mmapserver.cpp
	modified:   readme.md
	modified:   select/Makefile
	modified:   select/selectserver.cpp
	modified:   shmem-sem/Makefile
	modified:   shmem-sem/shmemsemserver.cpp
	modified:   shmem/Makefile
	modified:   shmem/shmemserver.cpp
	modified:   udp-epoll/Makefile
	modified:   udp-epoll/udpepollserver.cpp
	modified:   udp-kqueue/Makefile
	modified:   udp-kqueue/udpkqueueserver.cpp
	new file:   zeromq/Makefile
	new file:   zeromq/zeromqserver.cpp