Relocate 3.5.4_Streams_and_Delayed_Evaluation.scm.

The following file was move:

	3.5.4_Streams_and_Delayed_Evaluation.scm ->
	3.5.4_Streams_and_Delayed_Evaluation/3.5.4_Streams_and_Delayed_Evaluation.scm

Thank you!
							Lawrence X. Amlord
							  Dec 6th, 2013
							  Xi'an, China
Add my answer to Exercise 3.77.

Included are the following 2 files:

	Exercise_3.77.scm
	Test_for_Exercise_3.77.scm

Thank you!
							Lawrence X. Amlord
							  Dec 6th, 2013
							  Xi'an, China
Add my answer to Exercise 3.78.

Included is the following file:

	Exercise_3.78.scm

Thank you!
							Lawrence X. Amlord
							  Dec 6th, 2013
							  Xi'an, China
Add my answer to Exercise 3.79.

Included is the following file:

	Exercise_3.79.scm

Thank you!
							Lawrence X. Amlord
							  Dec 6th, 2013
							  Xi'an, China
Add my answer to Exercise 3.80.

Included are the following 2 files:

	Exercise_3.80.scm
	Test_for_Exercise_3.80.scm

Thank you!
							Lawrence X. Amlord
							  Dec 6th, 2013
							  Xi'an, China