Add water as first example layer

data.yml

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+_prefs: 
+  disabled: []
+  inspector: false
+  mapid: ''
+  rev: ''
+  saveCenter: true
+attribution: "<a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap contributors</a>"
+center: 
+  - 8.6627
+  - 47.3872
+  - 0
+description: "Free global vector tiles from OpenStreetMap. http://osm2vectortiles.org"
+Layer: 
+  - id: water
+    Datasource: 
+      dbname: osm
+      extent: -20037508.34,-20037508.34,20037508.34,20037508.34
+      geometry_field: geom
+      geometry_table: ''
+      host: db
+      key_field: ''
+      key_field_as_attribute: ''
+      max_size: 512
+      password: osm
+      port: 5432
+      srid: ''
+      table: |-
+        ( SELECT *
+          FROM (
+              SELECT * FROM water_z0
+              WHERE z(!scale_denominator!) = 0
+              UNION ALL
+              SELECT * FROM water_z1
+              WHERE z(!scale_denominator!) = 1
+              UNION ALL
+              SELECT * FROM water_z2
+              WHERE z(!scale_denominator!) BETWEEN 2 AND 3
+              UNION ALL
+              SELECT * FROM water_z4
+              WHERE z(!scale_denominator!) = 4
+              UNION ALL
+              SELECT * FROM water_z5
+              WHERE z(!scale_denominator!) = 5
+          ) AS water
+          WHERE geom && !bbox!
+        ) AS data
+      type: postgis
+      user: osm
+    description: Ocean and lake polygons
+    fields: {}
+    properties: 
+      "buffer-size": 4
+    srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+maxzoom: 14
+minzoom: 0
+name: OSM2VectorTiles v3.0