Fix collision points of object

Removed collision_points_orig and had the object regenerate collision points based
on the alpha value of each pixes in the image every time the image is resized (well every time it is resized and we still need
collision points

	modified:   readme.md
	modified:   src/Avatar.cpp
	modified:   src/Avatar.h
	modified:   src/Object.cpp
	modified:   src/Object.h
	modified:   src/ofApp.cpp