Fix issue 663: Grapher is producing corrupt graphs

This CL fixes issue 663, where implementation and instance nodes are set to be style=invis causing them not to show up on the Guice graph: https://code.google.com/p/google-guice/issues/detail?id=663&q=grapher&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Component

See here for the workaround that led to this solution: http://stackoverflow.com/questions/9301007/is-there-any-way-to-get-guice-grapher-to-work

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COMMIT=44428433
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