New set for reinforced floors

![reinforced_tileset](https://cloud.githubusercontent.com/assets/5224390/5062261/ea0ce37c-6db9-11e4-87af-f91a1239ece2.png)
I always found reinforced floors fugly so I replaced all the fugly tiles with less fugly ones. 
I was planning on adding other tiles but now I saw that the floor dmi is a fucking mess so I'm going to have to fix that first.