Merge branch 'master' into ajk2214

* master:
  remove debugging code
  add coloring algorithm
  greedy coloring algorithm
  added a little wiggle room for the graph building function, and used it in our move() implementation
  added function in Player to create graph
  minor changes to SeedNode constructor
First version of physical-based packing algorithm
Remove debug location added to output, which causes it to be rejected
Improved physical packing algorithm by placing next circle in a sparse region and allowing for exact jiggles
fix merge conflict
Merge pull request #6 from adamreis/physical-packing

Physical packing