Added config example to node example file

There is (understandably) some confusion about how the config files works (see svg#439) so I've added an example (the one given in that issue) in place of a fairly useless placeholder

examples/test.js

@@ -4,7 +4,79 @@ var FS = require('fs'),
     PATH = require('path'),
     SVGO = require('../lib/svgo'),
     filepath = PATH.resolve(__dirname, 'test.svg'),
-    svgo = new SVGO(/*{ custom config object }*/);
+    svgo = new SVGO({
+        plugins: [{
+          cleanupAttrs: true,
+        }, {
+          removeDoctype: true,
+        },{
+          removeXMLProcInst: true,
+        },{
+          removeComments: true,
+        },{
+          removeMetadata: true,
+        },{
+          removeTitle: true,
+        },{
+          removeDesc: true,
+        },{
+          removeUselessDefs: true,
+        },{
+          removeEditorsNSData: true,
+        },{
+          removeEmptyAttrs: true,
+        },{
+          removeHiddenElems: true,
+        },{
+          removeEmptyText: true,
+        },{
+          removeEmptyContainers: true,
+        },{
+          removeViewBox: false,
+        },{
+          cleanUpEnableBackground: true,
+        },{
+          convertStyleToAttrs: true,
+        },{
+          convertColors: true,
+        },{
+          convertPathData: true,
+        },{
+          convertTransform: true,
+        },{
+          removeUnknownsAndDefaults: true,
+        },{
+          removeNonInheritableGroupAttrs: true,
+        },{
+          removeUselessStrokeAndFill: true,
+        },{
+          removeUnusedNS: true,
+        },{
+          cleanupIDs: true,
+        },{
+          cleanupNumericValues: true,
+        },{
+          moveElemsAttrsToGroup: true,
+        },{
+          moveGroupAttrsToElems: true,
+        },{
+          collapseGroups: true,
+        },{
+          removeRasterImages: false,
+        },{
+          mergePaths: true,
+        },{
+          convertShapeToPath: true,
+        },{
+          sortAttrs: true,
+        },{
+          transformsWithOnePath: false,
+        },{
+          removeDimensions: true,
+        },{
+          removeAttrs: {attrs: '(stroke|fill)'},
+        }]
+      });
 
 FS.readFile(filepath, 'utf8', function(err, data) {