Line2: Pass geometry and material into super constructor

[jeffpyke]

Performance optimization to avoid constructing an extra mesh and material in the super class if geometry and material are passed in.

[mrdoob]

I think it would be better to do this instead?

THREE.Line2 = function ( geometry, material ) {

	if ( geometry === undefined ) geometry = new THREE.LineGeometry();
	if ( material === undefined ) material = new THREE.LineMaterial( { color: Math.random() * 0xffffff } );

	THREE.LineSegments2.call( this, geometry, material );

	this.type = 'Line2';

};

[jeffpyke]

Done.

[mrdoob]

Thanks!