started hw4.
added hw4 problem statements and auxillary data.
Merge branch 'master' into hw4

Conflicts:
	HW_solutions/HW4/HW4.pdf
removed old hw4.pdf
updated hw4.pdf.
started question 3.
finished question 3.
added solution to question 1.
added SmallTest.txt, kFoldCV.R, and script that contains all of q4's analysis.
added solution to #4.
added april 30's lab demonstration.