Add to_mesh for generalization
#14
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I thought I'd put up a PR for a helpful tool that I believe is fairly generic. This adds a function,
to_mesh, which returns a matrix of vertices and a matrix of triangles. While it's not the most efficient, it's fast enough for small problems particularly with distmesh-style triangulations (it scales polynomially with the number of triangles attached to each vertex, which distmesh tends to cut down on).