add solution to Exercise 2.2.

Included are the following 2 files:

	interact.py
	script.py

Thank you!
							Lawrence X. Amlord
							  Apr 9th, 2014
							  Xi'an, China
add solution to Exercise 3.1.

Included is the following file:

	lyrics.py

Thank you!
							Lawrence X. Amlord
							  Apr 10th, 2014
							  Xi'an, China
add solution to Exercise 3.2.

Included is the following file:

	lyrics2.py

Thank you!
							Lawrence X. Amlord
							  Apr 10th, 2014
							  Xi'an, China
add solution to Exercise 3.3.

Included is the following file:

	right_justify.py

Thank you!
							Lawrence X. Amlord
							  Apr 10th, 2014
							  Xi'an, China