Adds sankey diagrams

Author: JJ

doc-files-filtered.gephi

@@ -0,0 +1,9 @@
+library("networkD3")
+library("igraph")
+
+data <- read_graph("perl6-ecosystem.net",format="pajek")
+issues <-  igraph_to_networkD3(data)
+sn <- sankeyNetwork(Links = issues$links, Nodes = issues$nodes, Source = "source",
+                    Target = "target", Value = "value", NodeID = "name",
+                    units = "commits", fontSize = 20, nodeWidth=30)
+sn %>% saveNetwork( file= 'sankey.html' )