initialize Problem Set 3: Calculator Parser.

Included are the following 7 files:

	.classpath
	.project
	src/calculator/CalculatorTest.java
	src/calculator/Lexer.java
	src/calculator/MultiUnitCalculator.java
	src/calculator/Parser.java
	src/calculator/Type.java

Thank you!
							Lawrence X. Amlord
							  Oct. 15th, 2014
							   Xi'an, China