Add Example: Exponentiation-Linear_Recursive_Version in Chapter_1.

Included are the following 2 files:

	Exponentiation-Linear_Recursive_Version.scm
	Test_for_Exponentiation-Linear_Recursive_Version.scm

Thank you!
							Lawrence R. Amlord
							   May 7th, 2013
							   Xi'an, China
Add Example: Exponentiation-Linear_Iterative_Version in Chapter_1.

Included are the following 2 files:

	Exponentiation-Linear_Iterative_Version.scm
	Test_for_Exponentiation-Linear_Iterative_Version.scm

Thank you!
							Lawrence R. Amlord
							   May 7th, 2013
							   Xi'an, China
Add Example: Fast_Exponentiation in Chapter_1.

Included are the following 2 files:

	Fast_Exponentiation.scm
	Test_for_Fast_Exponentiation.scm

Thank you!
							Lawrence R. Amlord
							   May 7th, 2013
							   Xi'an, China