title: Modifying vertex properties in a Boost::Graph
body: <p>I am trying to figure out how to use boost::graph to store some information. However, there is information I want tied to each vertex. Staring at the documentation for the library reveals either(a)badly written documentation, or (b), I'm obviously not as good at C++ as I thought. Pick two.</p>
  
  <p>I am looking for a simple example use.</p>