Remove some no longer used dependencies

Author: marco-c

package.json

@@ -39,21 +39,17 @@
     "chalk": "^1.1.3",
     "chromedriver": "^2.24.1",
     "del": "^2.2.1",
-    "dmg": "^0.1.0",
     "eslint": "^3.5.0",
     "eslint-config-airbnb": "^11.1.0",
     "eslint-plugin-import": "^1.16.0",
-    "fs-extra": "^0.30.0",
     "geckodriver": "^1.1.2",
     "istanbul": "^0.4.2",
     "mkdirp": "^0.5.1",
     "mocha": "^3.0.2",
     "portfinder": "^1.0.2",
-    "request": "^2.69.0",
     "selenium-assistant": "^1.0.0",
     "selenium-webdriver": "^3.0.0-beta-2",
     "semver": "^5.1.0",
-    "temp": "^0.8.3",
     "which": "^1.2.11"
   },
   "engines": {