start ripping out all version2 stuff and utilize ffi-rzmq-core
changes for ffi-rzmq-core dependency
Merge branch 'master' of github.com:chuckremes/ffi-rzmq into v2

Conflicts:
	History.txt
	ffi-rzmq.gemspec
	lib/ffi-rzmq/constants.rb
	lib/ffi-rzmq/context.rb
	lib/ffi-rzmq/libc.rb
	lib/ffi-rzmq/libzmq.rb
	lib/ffi-rzmq/message.rb
	lib/ffi-rzmq/socket.rb
	lib/ffi-rzmq/util.rb
	lib/ffi-rzmq/version.rb
change name from NonBlocking to DONTWAIT
remove files that have moved to ffi-rzmq-core
support only libzmq 3.2+ and 4.x api
misc fixups
depend on ffi-rzmq-core
update rubinius target
update path to library