fix(Documentation): add etcd-dump to libraries and tools

Fixes #325

Documentation/libraries-and-tools.md

@@ -3,6 +3,7 @@
 **Tools**
 
 - [etcdctl](https://github.com/coreos/etcdctl) - A command line client for etcd
+- [etcd-dump](https://npmjs.org/package/etcd-dump) - Command line utility for dumping/restoring etcd.
 
 **Go libraries**