Remove gulp-load-plugins dependency. It is not needed.

package.json

@@ -37,7 +37,6 @@
     "gulp-gunzip": "~0.0.3",
     "gulp-htmlmin": "^1.3.0",
     "gulp-inject": "~3.0.0",
-    "gulp-load-plugins": "~1.2.0",
     "gulp-minify-css": "^1.2.2",
     "gulp-protractor": "~2.1.0",
     "gulp-rename": "~1.2.2",