Count colors used in coloring solution
Merge pull request #1 from fergemann/master

Improved window resizing behavior in coloring visualization
Feasibility checking for coloring: color count and bad edges
Merge remote-tracking branch 'upstream/master' into feasibility
Error checking on TSP: objective value, unvisited nodes, revisited nodes.
Also changed node numbering to start at zero rather than one.
Changed terminology from "warehouse" to "facility"
FLP: Error checking and corrected capacity/cost mixup in problem format
Clean up error-checking code on tsp and coloring. Let tool-tips grow vertically.