GML Format and meta data

[Jitzeoomen]

Hi!

I'm working on a project whereby I'm loading a GML file which includes node meta data, roughly in the following format;

node
  [
    id 0
    type "Person"
    age "67"
    gender "Female"
  ]

I've adapted the function _gml_read_one_graph(gs, dir) function to return a MetaGraph object which has the properties from the GML file stored as properties with the vertices. Would an implementation be of interest for GraphIO.jl (or MetaGraphs.jl)?

[storopoli]

I think yes. If you could add the desired tests and update the README.md table.