Merge pull request #138 from GordonSmith/GH-137-GetLocalisedXGMML_Skips_outer_subgraph

GH-137 GetLocalisedXGMML Skips outer subgraph(s)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
GH-135 Allow passing of DOT meta attributes

Allow passing additional DOT attributes (for disabling splines etc.).

Fixes GH-135-Pass_DOT_Attrs

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>