Merge pull request #280 from ckeditor/t/279

Removes unused packages

package.json

@@ -25,10 +25,6 @@
     "requirejs": "Reinmar/requirejs"
   },
   "devDependencies": {
-    "babel-core": "^6.9.0",
-    "babel-plugin-transform-es2015-modules-amd": "^6.8.0",
-    "babel-plugin-transform-es2015-modules-commonjs": "^6.10.0",
-    "babel-preset-es2015-rollup": "^1.1.1",
     "benderjs": "^0.4.1",
     "benderjs-chai": "^0.2.0",
     "benderjs-coverage": "benderjs/benderjs-coverage#t/4",
@@ -42,24 +38,12 @@
     "ckeditor5-dev-lint": "ckeditor/ckeditor5-dev-lint",
     "ckeditor5-dev-utils": "ckeditor/ckeditor5-dev-utils",
     "gulp": "^3.9.0",
-    "gulp-babel": "^6.1.0",
-    "gulp-cssnano": "^2.1.2",
     "gulp-filter": "^3.0.1",
     "gulp-filter-by": "^1.2.0",
     "gulp-istanbul": "^0.10.4",
-    "gulp-mirror": "^1",
     "gulp-mocha": "^2.2.0",
-    "gulp-plumber": "^1.1.0",
-    "gulp-rename": "^1.2.2",
-    "gulp-replace": "^0.5.4",
-    "gulp-sourcemaps": "^1.6.0",
-    "gulp-svg-sprite": "^1.2.19",
-    "gulp-uglify": "^1.5.4",
     "gulp-util": "^3.0.7",
-    "gulp-watch": "^4.3.7",
     "guppy-pre-commit": "^0.3.0",
-    "mockery": "^1.4.0",
-    "regenerator-runtime": "^0.9.5",
     "run-sequence": "^1.1.5",
     "semver": "^5.1.0",
     "sinon": "^1.17.0",