Switch to use automated png optimizations in assetgraph

Makefile

@@ -4,6 +4,7 @@ public-min: public/index.html $(deps)
 	node_modules/assetgraph-builder/bin/buildProduction \
 	    --root public \
 	    --outroot public-min \
+	    --optimizepngs \
 	    $<
 
 PHONY: clean

package.json

@@ -23,7 +23,7 @@
     "connect": "~2.0.3"
   },
   "devDependencies": {
-    "assetgraph-builder": ">=0.2.37"
+    "assetgraph-builder": ">=0.3.38"
   },
   "engines": {
     "node": ">=0.6"
@@ -41,4 +41,4 @@
     "cssarrowplease.com",
     "www.cssarrowplease.com"
   ]
-}
+}

public/css/app.css

@@ -59,13 +59,14 @@ input[type='radio']           { border: 0; }
 
 /* fork_me */
 .fork_me                          { position: absolute; top: 0; right: 0; display: block; width: 149px; height: 149px; background: url(../img/fork.png);
+  -one-image-postprocess: pngquant(128);
   opacity: 0.7;
   -webkit-transition: all 0.2s ease-in;
      -moz-transition: all 0.2s ease-in;
           transition: all 0.2s ease-in;
 }
-.fork_me:hover { 
-  opacity: 1; 
+.fork_me:hover {
+  opacity: 1;
   -webkit-transform: scale(1.03);
      -moz-transform: scale(1.03);
           transform: scale(1.03);