SpiralMatrix

Given a N by M matrix of numbers, print out the matrix in a spiral.

For example, given the following matrix:

		[[1, 2, 3, 4, 5], 
		 [6, 7, 8, 9, 10],
		 [11, 12, 13, 14, 15],
		 [16, 17, 18, 19, 20]]

You should print out the following:

		1
		2
		3
		4
		5
		10
		9
		8
		7
		6
		11
		12
		13
		14
		15
		20
		19
		18
		17
		16