adding eccentricity
updating makefile
adding eccentricity heading
all shortest paths now calls single shortest path, single shortest path now actually passes back the computed value by reference and starts with the correct source node
minor edits
Merge remote branch 'upstream/master'
minor edits
shortest_path all now calls single path; single path now correctly populates/returns the shortest path values and starts from the correct source node; removed excess print statements
Merge pull request #22 from spowers/master

shortest path fixes