test files for -l parameter

files/demo.layers

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+[{
+    "id": "world",
+    "name": "world",
+    "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs",
+    "Datasource": {
+        "file": "http://tilemill-data.s3.amazonaws.com/world_borders_merc.zip",
+        "type": "shape",
+        "estimate_extent": "true",
+        "id": "world"
+    }
+},
+{
+    "id": "countries",
+    "name": "countries",
+    "srs": "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs",
+    "class": "countries",
+    "Datasource": {
+        "file": "http://tilemill-data.s3.amazonaws.com/world_borders.zip",
+        "type": "shape",
+        "estimate_extent": "id",
+        "id": "countries"
+    }
+}]

files/demo.mss

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+#world {
+  polygon-fill:#CCC;
+}