Murmur3 support for ConsistentHash routing

Big changes to look at are

* Algorithm implementation in Akka.Util: https://github.com/Aaronontheweb/akka.net/blob/656e1deae8c6f6b53321590ce830c4b700c6ca25/src/Akka/Util/MurmurHash.cs
* Algorithm integration into ConsistentHash: https://github.com/Aaronontheweb/akka.net/blob/656e1deae8c6f6b53321590ce830c4b700c6ca25/src/Akka/Util/MurmurHash.cs