Upgrade ruby to 2.1.3
Remove the Kusner implementation
Import description of Gabow's algorithm
gabow WIP
Trival BFS
Avoid recursion in BFS

.. to avoid a stack overflow for large graphs
Typo
Begin applying what I learned about BFS
Begin to implement E5, E7
Continue work on E2 BFS.  TODO: L0 (edge labeling)
First draft of Gabow's L-function
Continued work implementing Gabow's algorithm

Getting close, perhaps.  Gabow's L-function seems to be
edge-labeling.  TODO: finish implementing Gabow's R-function.
First success using Gabow's 1976 algorithm

Finish implementing Gabow's R-function
Gabow takes all comers!
Testing Gabow with various complete graphs
Fix various tests left over from the Kusner attempt