Add the test for Example: Sets as binary trees.

Included is the following file:

	Test_of_Sets-Binary_Trees.scm

Thank you!
							Lawrence R. Amlord
							   Jul 21st, 2013
							   Xi'an, China
Add my answer to Exercise 2.63.

Included are the following 4 files:

	Exercise_2.63.pdf
	Exercise_2.63.scm
	Exercise_2.63.tm
	Test_of_Exercise_2.63.scm

Thank you!
							Lawrence R. Amlord
							   Jul 21st, 2013
							   Xi'an, China