fix camera orientation.

now it's more like looking around and less like rotating around the
focus.

js/pixl/public/trixl.html

		var offset = {x: 0, y: 0, z: 0};
		program.transform = gl.getUniformLocation(program, 'transform');
		trixl.redraw = function() {
			var camera = mat4.lookAt([], trixl.camera.pos, trixl.camera.focus, trixl.camera.up);
			var view = mat4.invert([], camera);
			var view = mat4.lookAt([], trixl.camera.pos, trixl.camera.focus, trixl.camera.up);
			var aspect = trixl.window.w / trixl.window.h;
			var transform = function(pos) {