Add files for priority queues.
Reversed meaning of "highest priority" in priority queues.
Add an adapter for Java's built-in priority queues.
Update intro comment in BuiltinPriorityQueue
Rename the primary priority queue experiments.
Merge https://github.com/Grinnell-CSC207/linear
Added the recurence relations
Merge https://github.com/manuella/csc207-hw9

Conflicts:
	csc207-hw9/src/Calculator.java