Add an XCode 6 QuickLook preview of a tile

[dblock]

It would be helpful to add a border to the image tile that would be visible in a preview in XCode, along with maybe text that tells you the tile coordinate.

[orta]

added this to ARTile, https://github.com/dblock/ARTiledImageView/blob/master/Classes/ARTile.m#L29

[dblock]

I think we want more than this. We want to see tile borders and coordinates for the tiles.