Fixed Issue 170:  	 zigzag operation ignores maximum x and y properties.
Fixed Issue 170:  	 zigzag operation ignores maximum x and y properties.
gaziel/heekscnc,gaziel/heekscnc,gaziel/heekscnc,tbinias/heekscnc,tbinias/heekscnc,tbinias/heekscnc,tbinias/heekscnc,gaziel/heekscnc