function stairs(blockType, width, height) {
  if (typeof width === 'undefined') width = 1;
  if (typeof height === 'undefined') height = 1;
  if (typeof blockType === 'undefined') {
    blockType = blocks.stairs.oak;
  }
  var bm = this.getBlockIdAndMeta(blockType);
  this.then(function() {
    this.chkpt('_stairs');
    while (height > 0) {
      this.traverseWidth(width, function() {
        this.setBlock(bm[0], bm[1]);
      });

      this.fwd().up();
      height -= 1;
    }
    this.move('_stairs');
  });
}
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### Drone.stairs() function

The stairs() function will build a flight of stairs

#### Parameters
blockType - should be one of the following: 
blocks.stairs.oak
blocks.stairs.cobblestone
blocks.stairs.brick
blocks.stairs.stone
blocks.stairs.nether
blocks.stairs.sandstone
blocks.stairs.spruce
blocks.stairs.birch
blocks.stairs.jungle
blocks.stairs.quartz
width - The width of the staircase - default is 1
height - The height of the staircase - default is 1

#### Example

To build an oak staircase 3 blocks wide and 5 blocks tall:

    /js stairs(blocks.stairs.oak, 3, 5) 

Staircases do not have any blocks beneath them.
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