Merge pull request #285 from mozilla/grunt-modernizr-fix

Fixed issue with grunt build not completing correctly

package.json

@@ -44,7 +44,7 @@
     "grunt-autoprefixer": "~0.2.0",
     "grunt-usemin": "~0.1.10",
     "grunt-mocha": "~0.4.0",
-    "grunt-modernizr": "~0.3.0",
+    "grunt-modernizr": "~0.4.1",
     "grunt-requirejs": "~0.4.0",
     "grunt-svgmin": "~0.2.0",
     "grunt-concurrent": "~0.3.0",