+tweaked d' calculation
+added toggle to fill or show spine
+Now also works with curves not on xy plane
(need min 3 control points)
Merge branch 'Arindam-QuinticSpine' of github.com:jking31cs/ModelSoftware into bobby_ballmorph

Conflicts:
	src/TestApplet.java
	src/edu/cs6491Final/SplineLine.java