Added jslint/jshint options to ignore some js and jquery errors
Changed jslint/jshint options to get rid of an error
Changed position from relative to absolute.
With relative, the snake-head-divs would move RELATIVE to each other, which is not wanted here. Absolute guarantees them to stay where I put them.
Adds interval to add a new snake head every 500ms and changes the currentY/Xpos accordingly. Can change direction as well.