code: function(coords) {
  
  			var dist = 0, last;
  			for (var i = 0, l = coords.length; i < l; ++i) {
  				if(last) {
  					dist += geolib.getDistance(coords[i], last);
  				}
  				last = coords[i];
  			}
  
  			return dist;
  
  		}
docs: Calculates the length of a given path
  
  @param		mixed		array or object with coords [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
  @return		integer		length of the path (in meters)