Add a single command for linting.

package.json

@@ -13,6 +13,7 @@
     "gulp-if": "^2.0.1",
     "gulp-sass": "^2.3.2",
     "gulp-sourcemaps": "^1.6.0",
+    "npm-run-all": "^2.2.0",
     "raw-loader": "^0.5.1",
     "sass-loader": "^3.2.1",
     "stylint": "^1.3.10",
@@ -51,6 +52,7 @@
     "postinstall": "typings install",
     "tslint": "tslint 'src/**/*.ts' 'config-serializer/**/*.ts'",
     "stylelint": "stylelint 'src/**/*.scss' 'sass/**/*.scss' --syntax scss",
+    "lint": "run-s -scn tslint stylelint",
     "typings": "typings",
     "build": "gulp",
     "build:test": "webpack --config 'config-serializer/webpack.config.js'",