Revert "Upgraded dependencies from security advisories (auth0#1848)" (auth0#1853)

This reverts commit e584e1a.

Author: Steve Hobbs

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   build-and-test:
     docker:
-      - image: circleci/node:10-browsers
+      - image: circleci/node:8.11.3-browsers
     environment:
           LANG: en_US.UTF-8
     steps:

package.json

@@ -67,18 +67,18 @@
     "expect.js": "^0.3.1",
     "flat": "^2.0.1",
     "glob": "^7.1.6",
-    "grunt": "^1.1.0",
+    "grunt": "^0.4.5",
     "grunt-babel": "^6.0.0",
-    "grunt-cli": "^1.3.2",
-    "grunt-concurrent": "^3.0.0",
-    "grunt-contrib-clean": "^2.0.0",
-    "grunt-env": "^1.0.1",
-    "grunt-exec": "^3.0.0",
+    "grunt-cli": "^0.1.13",
+    "grunt-concurrent": "^2.3.1",
+    "grunt-contrib-clean": "^0.6.0",
+    "grunt-env": "^0.4.4",
+    "grunt-exec": "^0.4.6",
     "grunt-webpack": "^2.0.1",
     "husky": "^0.14.3",
     "jest": "^21.2.1",
     "json-beautify": "^1.0.1",
-    "jsonwebtoken": "^8.5.1",
+    "jsonwebtoken": "^7.3.0",
     "lint-staged": "^4.2.3",
     "mochify": "^6.3.0",
     "node-es-module-loader": "^0.3.8",
@@ -115,21 +115,6 @@
     "trim": "0.0.1",
     "url-join": "^1.1.0"
   },
-  "resolutions": {
-    "minimist": "^0.2.1",
-    "handlebars": "^4.7.6",
-    "set-value": "^3.0.2",
-    "js-yaml": "^3.13.1",
-    "minimatch": "^3.0.4",
-    "cryptiles": "^4.1.3",
-    "mime": "^1.4.1",
-    "lodash": "^4.17.15",
-    "underscore.string": "^3.3.5",
-    "tunnel-agent": "^0.6.0",
-    "request": "^2.68.0",
-    "hoek": "^4.2.1",
-    "mem": "6.1.0"
-  },
   "ccu": {
     "name": "lock",
     "cdn": "https://cdn.auth0.com",