cleanup: rename package and vendor dependencies for old go versions

Fixes #8 and begins to address deployability.

vendor/github.com/pebbe/zmq4/README.md

@@ -0,0 +1,75 @@
+A Go interface to [ZeroMQ](http://www.zeromq.org/) version 4.
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/pebbe/zmq4)](https://goreportcard.com/report/github.com/pebbe/zmq4)
+[![GoDoc](https://godoc.org/github.com/pebbe/zmq4?status.svg)](https://godoc.org/github.com/pebbe/zmq4)
+
+This requires ZeroMQ version 4.0.1 or above. To use CURVE security in
+versions prior to 4.2, ZeroMQ must be installed with
+[libsodium](https://github.com/jedisct1/libsodium) enabled.
+
+Partial support for ZeroMQ 4.2 DRAFT is available in the alternate
+version of zmq4 `draft`. The API pertaining to this is subject to
+change. To use this:
+
+    import (
+        zmq "github.com/pebbe/zmq4/draft"
+    )
+
+For ZeroMQ version 3, see: http://github.com/pebbe/zmq3
+
+For ZeroMQ version 2, see: http://github.com/pebbe/zmq2
+
+Including all examples of [ØMQ - The Guide](http://zguide.zeromq.org/page:all).
+
+Keywords: zmq, zeromq, 0mq, networks, distributed computing, message passing, fanout, pubsub, pipeline, request-reply
+
+### See also
+
+ * [Mangos](https://github.com/go-mangos/mangos) — An implementation in pure Go of the SP ("Scalable Protocols") protocols
+ * [go-nanomsg](https://github.com/op/go-nanomsg) — Language bindings for nanomsg in Go
+ * [goczmq](https://github.com/zeromq/goczmq) — A Go interface to CZMQ
+
+## Install
+
+    go get github.com/pebbe/zmq4
+
+## Docs
+
+ * [package help](http://godoc.org/github.com/pebbe/zmq4)
+ * [wiki](https://github.com/pebbe/zmq4/wiki)
+
+## API change
+
+There has been an API change in commit
+0bc5ab465849847b0556295d9a2023295c4d169e of 2014-06-27, 10:17:55 UTC
+in the functions `AuthAllow` and `AuthDeny`.
+
+Old:
+
+    func AuthAllow(addresses ...string)
+    func AuthDeny(addresses ...string)
+
+New:
+
+    func AuthAllow(domain string, addresses ...string)
+    func AuthDeny(domain string, addresses ...string)
+
+If `domain` can be parsed as an IP address, it will be interpreted as
+such, and it and all remaining addresses are added to all domains.
+
+So this should still work as before:
+
+    zmq.AuthAllow("127.0.0.1", "123.123.123.123")
+
+But this won't compile:
+
+    a := []string{"127.0.0.1", "123.123.123.123"}
+    zmq.AuthAllow(a...)
+
+And needs to be rewritten as:
+
+    a := []string{"127.0.0.1", "123.123.123.123"}
+    zmq.AuthAllow("*", a...)
+
+Furthermore, an address can now be a single IP address, as well as an IP
+address and mask in CIDR notation, e.g. "123.123.123.0/24".