create VertexAssociationProducer.cc - contains nonsense so far
Merge remote-tracking branch 'upstream/master' into dev_vertex
DzVertexAssociationProducer - not working yet
association now works, still working on readout and using
changes to use an ordinary map with pointers instead of AssociationMap
fix up runtime errors
turn off verbose messages
add flag to allow tracks to be associated to multiple vertices
Merge pull request #13 from sethzenz/dev_vertex

Code to create, store, and read back vertex-candidate map