zeromq.spec.in/Makefile: README is no more; replace with README.md

Signed-off-by: Dan Mick <dan.mick@redhat.com>
zeromq.spec.in: Missing build dependencies in specfile: asciidoc, xmlto

Signed-off-by: Dan Mick <dmick@redhat.com>
zeromq.spec.in: missing binary curve_keygen

Signed-off-by: Dan Mick <dmick@redhat.com>
zeromq.spec.in: shared library version bump

Signed-off-by: Dan Mick <dmick@redhat.com>
zeromq.spec.in: missing manpage files

Signed-off-by: Dan Mick <dmick@redhat.com>