Hungarian Graph class implemented
Converted to numpy style, much slower though, by factor 10
Added both class types to the lib file. Currently setup to use the old version. NumPy version scales better for larger datasets.
Merged jonnybazookatone's changes; implementation of assignment algorithm now a choice
Merge branch 'jonnybazookatone-master'
Cleaner class definition for Assignment algorithm, numpy implementation
Deal with empty author lists
Better handling of empty author list, affiliation transfer to best results.
Merge pull request #47 from aaccomazzi/master

closes #46 (divide by 0), merge jonnybazookatone code (closes #45)