Merge pull request #597 from csduarte/BASH-23

BASH-23 Add npm clean script

package.json

@@ -20,6 +20,7 @@
     "build:main": "cross-env NODE_ENV=production webpack --bail --config webpack.config.main.js",
     "build:renderer": "cross-env NODE_ENV=production webpack --bail --config webpack.config.renderer.js",
     "start": "electron src --disable-dev-mode",
+    "clean": "rm -rf release/ node_modules/ src/node_modules/ && find src -name '*_bundle.js' | xargs rm",
     "watch": "run-p watch:*",
     "watch:main": "node scripts/watch_main_and_preload.js",
     "watch:renderer": "webpack-dev-server --config webpack.config.renderer.js",