add solution to Problem 1 in Problem Set 1.

Augmented are the following 2 files:

	PiGenerator.java
	PiGeneratorTest.java

Thank you!
							Lawrence X. Amlord
							  Oct 3rd, 2014
							  Xi'an, China
add solution to Problem 2 in Problem Set 1.

Augmented are the following 2 files:

	BaseTranslator.java
	BaseTranslatorTest.java

Thank you!
							Lawrence X. Amlord
							  Oct 3rd, 2014
							   Xi'an, China