Add answer to Extended_Exercise_1.1.

Recommended by the author, this extended exercise located in Section I.2.4
in the textbook. It really is worthwhile to have a trial. Included are the
following 2 files:

	Exercise_X1.1.pdf
	Exercise_X1.1.tm

If you have any question with this solution, please contact me through the
email put in my GitHub account.

Thank you!
							Lawrence R. Amlord
							   Apr. 10, 2013
							   Xi'an, China