add solution to Part 3 of OOP Java in Lab 0.2.

Modified is the following file:

	oop_answer.md

Thank you!
							Lawrence X. Amlord
							  Apr 30th, 2014
							  Xi'an, China
add solution to Part 4 of OOP Java in Lab 0.2.

Included are the following 5 files:

	HolidayLights.java
	HolidayLightsWindow.java
	Main.java
	RunningHolidayLights.java
	RunningHolidayLightsTest.java

Thank you!
							Lawrence X. Amlord
							  Apr 30th, 2014
							  Xi'an, China