Merge pull request JuliaAttic#191 from JuliaGraphs/persistence-fixup

close JuliaAttic#188

Author: sbromberger

src/LightGraphs.jl

@@ -139,7 +139,11 @@ include("core.jl")
         include("shortestpaths/floyd-warshall.jl")
         include("spectral.jl")
         include("operators.jl")
-        include("persistence.jl")
+        include("persistence/default.jl")
+        include("persistence/dot.jl")
+        include("persistence/gexf.jl")
+        include("persistence/gml.jl")
+        include("persistence/graphml.jl")
         include("randgraphs.jl")
         include("smallgraphs.jl")
         include("centrality/betweenness.jl")