Some changes.
Raw SVG support.

I have used JFreeSVG to support the SVG export capability.
Support to create nodes and edges interactively.

The file format has changed, now the input file can contain (optional) information
about the position of the vertices.

The user can create nodes and edges between vertices interactively.
v0.2 Support to create graphs interactively.

Added support to save files wit format Graph Illustrator (.gi).

Added support to export the graph to SVG format.

Added support to create and delete nodes and edges interactively.