Returned previous code section for reference, commented out for now.
Edited method extendCentralDogmaNodes(). For protein 
complexes/families, call parseName() to store 
complex in a directed graph. Then call 
convertPathway() to convert to a set of factors, to 
be used in construction of factor graph later.
Added code to add CD nodes for singple protein nodes. Need to put
factors into List instead of Set.