Add hashCode and equal to Node to help equals function
Add Kruskal's method implementation for Stars to build constellations.  Uses a StarSpace which splits the image into blocks to shorten search space for neighboring stars.
Untrack images
Make radius of star actually compute radius of star
Move reading and copying an image to functions
Move building all the initial pixel edges to its own function
Move finding stars into its own function
Make functions in Stars.java public so tests can access them
Move writing images to own function
Add a test for our StarSpace.  Finds all big enough star neighbors in a radius.
Make sure stars are big enough to search for neighbors
Tracked JUnit build stuff
Change radius threshold to be a constant variable
Remove unused stuff
Greg was doing other stuff simultaneously
Revert "Tracked JUnit build stuff"

This reverts commit e500c6208fb1a48f329bf244da6947417fd8fd66.
Revert "Greg was doing other stuff simultaneously"

This reverts commit ee32455368d6ad6e6f0108c24978023c756ebf8f, reversing
changes made to 15740dce0e9c491ccd9ba16be2e2b22357a69006.
Revert "Revert "Tracked JUnit build stuff""

This reverts commit 783238bbe61147e391a6a59719847056ff3b5b73.