Added downsample function to utils file
Added test to the main file to show how downSample works
Added buildGaussianPyramid function to utils.cpp
Merge branch 'ft/downsample' into ft/gaussian_pyramid

Conflicts:
	include/utils.h
	src/utils.cpp
switched octaves and scales indexing in the pyramid

Also added printed pyramid in main file
Added global file with defines for parameters
Fixed naming scheme for some variables
Merge pull request #4 from sshihata/ft/gaussian_pyramid

Ft/gaussian pyramid