Updating image-class.
 - Now save using saveImage(filename)
 - Open using loadImage();
 
Mutators/Accessors:
 - getPixel(x,y);
 - setPixel(x,y, val);
Cleaning up
Update README.md
Merge remote-tracking branch 'origin/Mathias' into Keerthikan

Conflicts:
	README.md
	src/Coverage/Coverage/Coverage_planning/Coverage_planning/Image.h