* Form1.cs: Changes:
Added methods to convert HexMapGraph edges collection (List) from
  TaggedEdge<Fief, String> to TaggedEdge<String, String> and write to
  Riak.
Added methods to read HexMapGraph edges collection from Riak; also to
  convert from List<TaggedEdge<String, String>> to TaggedEdge<Fief,
  String>[].

* HexMapGraph.cs: Added overidden constructor that creates HexMapGraph
  from an array of edges, then recreates the edge costs collection.