Consolidate some dev dependencies and use more maintained versions

package.json

@@ -22,13 +22,12 @@
     "ejs": "^2.5.5",
     "express": "^4.16.4",
     "fast-glob": "^2.2.6",
-    "glob": "^7.1.3",
     "grunt": "^1.0.4",
     "grunt-cli": "^1.3.2",
     "grunt-contrib-compress": "^1.3.0",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-jshint": "^2.0.0",
-    "grunt-image-embed": "^0.3.3",
+    "grunt-css-url-embed": "^1.11.1",
     "grunt-sass": "^3.0.2",
     "jasmine": "^3.3.1",
     "jsdom": "^13.1.0",