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graph500 with the boost graph library

Because I don't have enough to do... I decided to start trying to implement the graph500 benchmark in the boost graph library and then the parallel boost graph library.

I've got a very simply implementation working using an adjacency_list and a BFS visitor but I'm sure I can do much better.

On my box:
seq-csr at scale 20 is ~3.5e+07 TEPS
adjacency-list at scale 20 is ~5.0e+07 TEPS
(TEPS: traversed edges per second)

I'll work on this one a bit more and then try a compressed sparse row graph.
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