Use rimraf in build's clean step instead of rm -rf (to work cross-platform)

Fix for #14

Author: birdofpreyru

package-lock.json

@@ -109,7 +109,7 @@
   "scripts": {
     "build": "npm run clean && ./node_modules/.bin/webpack --env=production --colors --display-optimization-bailout --profile --progress && BABEL_ENV=production babel src/server --out-dir dist/server && BABEL_ENV=production babel src/shared/utils/jest.jsx --out-file dist/shared/utils/jest.js && BABEL_ENV=production babel src/client/init.js --out-file dist/client/init.js",
     "build:dev": "npm run clean && (./node_modules/.bin/webpack --env=development --bail --colors --display-optimization-bailout --profile --progress --watch | BABEL_ENV=development babel src/server --out-dir dist/server --watch | BABEL_ENV=development babel src/shared/utils/jest.jsx --out-file dist/shared/utils/jest.js --watch | BABEL_ENV=development babel src/client/init.js --out-file dist/client/init.js --watch)",
-    "clean": "rm -rf dist && mkdir -p dist/shared/utils && mkdir -p dist/client",
+    "clean": "./node_modules/.bin/rimraf dist && mkdir -p dist/shared/utils && mkdir -p dist/client",
     "jest": "NODE_CONFIG_ENV=test jest --no-cache --maxWorkers=4 --config config/jest/default.js",
     "lint": "npm run lint:js && npm run lint:scss",
     "lint:js": "eslint --ext .js,.jsx .",