Update dependencies to more recent version

All these version ranges include the latest version at the time of this
commit, except for the selenium webdriver.  There version 3 is incompatible
with version 2, and switching to a version 3 library appears to require
switching to version 3 docker images as well, which would entail using
different browser versions which in turn would lead to differences for a
large number of screenshots.  That doesn't appear warranted at this time.

package.json

@@ -15,20 +15,20 @@
   ],
   "license": "MIT",
   "devDependencies": {
-    "browserify": "^10.2.4",
-    "clean-css": "~2.2.15",
-    "eslint": "^1.10.3",
-    "express": "~3.3.3",
-    "glob": "^5.0.15",
+    "browserify": "^13.3.0",
+    "clean-css": "^3.4.23",
+    "eslint": "^3.13.0",
+    "express": "^4.14.0",
+    "glob": "^7.1.1",
     "jasmine": "^2.3.2",
     "jasmine-core": "^2.3.4",
     "js-yaml": "^3.3.1",
-    "jspngopt": "^0.1.0",
+    "jspngopt": "^0.2.0",
     "less": "~2.7.1",
     "nomnom": "^1.8.1",
-    "pako": "0.2.7",
-    "selenium-webdriver": "^2.46.1",
-    "uglify-js": "~2.4.15"
+    "pako": "1.0.4",
+    "selenium-webdriver": "^2.48.2",
+    "uglify-js": "~2.7.5"
   },
   "bin": "cli.js",
   "scripts": {