Some minor codestyle improvements due to jshint

package.json

@@ -35,7 +35,6 @@
     "babel-preset-react": "^6.5.0",
     "chai": "^3.5.0",
     "chai-as-promised": "^5.3.0",
-    "del": "^2.2.2",
     "devtron": "^1.3.0",
     "electron-builder": "5.2.1",
     "electron-connect": "~0.3.9",
@@ -45,8 +44,6 @@
     "esformatter": "^0.9.6",
     "esformatter-jsx": "^7.0.1",
     "gulp": "^3.9.1",
-    "gulp-babel": "^6.1.2",
-    "gulp-changed": "^1.3.2",
     "gulp-diff": "^1.0.0",
     "gulp-esformatter": "^6.0.0",
     "gulp-jsbeautifier": "^2.0.3",