Make output more clear
Make output more clear

The output and code is now better structured. Layers, classes and types are alphabetically ordered for semantical comparison
```
name: open-streets
tile: z/y/x
features: [features.length]
layers: [layers.length]
classes: [classes.length]
types: [types.length]
[layer]
    [class]
        [type]
```

geometalab/osm2vectortiles,geometalab/osm2vectortiles,osm2vectortiles/osm2vectortiles,osm2vectortiles/osm2vectortiles