remove various unused tasks

www/modules/boilerplate/package.json

@@ -11,14 +11,10 @@
     "grunt-autoprefixer": "0.0.0",
     "grunt-contrib-concat": "0.0.0",
     "grunt-contrib-cssmin": "0.0.0",
-    "grunt-contrib-imagemin": "0.0.0",
-    "grunt-contrib-jshint": "0.0.0",
     "grunt-contrib-uglify": "0.0.0",
     "grunt-contrib-watch": "0.0.0",
     "grunt-csscomb": "0.0.0",
-    "grunt-jsonlint": "0.0.0",
     "grunt-notify": "0.0.0",
-    "grunt-phplint": "0.0.0",
     "grunt-sass": "0.0.0",
     "grunt-svgmin": "0.0.0",
     "grunt-svgstore": "0.0.0",