Adding symbolizer order test

test/rendering/symbolizer_order.mml

@@ -0,0 +1,15 @@
+{
+    "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",
+    "Stylesheet": [
+        "symbolizer_order.mss"
+    ],
+    "Layer": [{
+        "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/test_data/shape_demo.zip",
+            "type": "shape"
+        }
+    }]
+}

test/rendering/symbolizer_order.mss

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+#world {
+    polygon-fill: #fff;
+    line-width: 2;
+    }

test/rendering/symbolizer_order.result

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+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE Map[]>
+<Map  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">
+
+
+<Style name="world-polygon">
+  <Rule>
+    
+    <PolygonSymbolizer fill="#ffffff"/>
+  </Rule>
+</Style>
+<Style name="world-line">
+  <Rule>
+    
+    <LineSymbolizer stroke-width="2"/>
+  </Rule>
+</Style>
+<Layer
+   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">
+    <StyleName>world-line</StyleName>
+    <StyleName>world-polygon</StyleName>
+    <Datasource>
+       <Parameter name="file">[absolute path]</Parameter>
+       <Parameter name="type">shape</Parameter>
+    </Datasource>
+  </Layer>
+
+</Map>