fixed issue where too many valid_contours were being detected with images
that only had straight lines.
Create .gitignore
Changed parameters of functions that were cv::Mat to cv::Mat& references
minor changes
Merge branch 'master' of https://github.com/shamor/Senior-Design-I

Conflicts:
	Makefile
	black.png
	src/main.cpp
	src/vertexSearch.cpp
Merge branch 'master' of https://github.com/sbonner1/Senior-Design-I
Minor fixes for presentation.
Merged with Josh.