dx(build): provide means of build watching

README.md

@@ -96,6 +96,23 @@ Use your distribution's package manager to install.
 
 As you make changes, close the entire app (cmd-q on OS X, or ctrl-c at the terminal) then run `npm run start` again.
 
+##### Progressive Webpack build for the notebook 
+
+In separate terminals run:
+
+```
+npm run build:main
+npm run build:renderer:watch
+```
+
+and
+
+```
+NODE_ENV=development ./node_modules/electron/cli.js ./app/
+```
+
+The webpack build will keep occurring as you modify source. When you open a new notebook, you'll get the freshest copy of the notebook app.
+
 #### Build Documentation
 You can run nteract's documentation generator by running
 

webpack.config.js

@@ -38,8 +38,5 @@ module.exports = {
   externals: nodeModules,
   plugins: [
     new webpack.IgnorePlugin(/\.(css|less)$/),
-    new webpack.BannerPlugin('require("source-map-support").install();',
-                             { raw: true, entryOnly: false })
   ],
-  devtool: 'sourcemap'
 };