Add styleint (linter for scss files) with initial config.

package.json

@@ -15,6 +15,7 @@
     "gulp-sourcemaps": "^1.6.0",
     "raw-loader": "^0.5.1",
     "sass-loader": "^3.2.0",
+    "stylint": "^1.3.10",
     "ts-loader": "^0.8.2",
     "tslint": "^3.8.1",
     "typings": "^1.0.4",
@@ -47,7 +48,8 @@
   },
   "scripts": {
     "postinstall": "typings install",
-    "lint": "tslint 'src/**/*.ts' 'config-serializer/**/*.ts'",
+    "tslint": "tslint 'src/**/*.ts' 'config-serializer/**/*.ts'",
+    "stylelint": "stylelint 'src/**/*.scss' 'sass/**/*.scss' --syntax scss",
     "typings": "typings",
     "build": "gulp",
     "build:test": "webpack --config 'config-serializer/webpack.config.js'",