Updates to the webpacked example (#200)

* Notes on AMO reviews, update to webpack 2 and use better reset style for panel footer button

* Link to webpack-webext-plugin in live-dev section

webpack-modules/webpack.config.js

@@ -1,10 +1,12 @@
+const path = require("path");
+
 module.exports = {
     entry: {
         background_scripts: "./background_scripts/background.js",
         popup: "./popup/left-pad.js"
     },
     output: {
-        path: "addon",
+        path: path.resolve(__dirname, "addon"),
         filename: "[name]/index.js"
     }
 };