Exclude some files from inclusion in packaged app

This adds and extends the default `files` config from electron-builder
such that it adds all and only the necessary files to our app.asar.

// FREEBIE

package.json

@@ -47,18 +47,26 @@
     },
     "win": {},
     "files": [
-      "main.js",
-      "background.html",
-      "index.html",
-      "options.html",
-      "_locales/**",
-      "protos/*",
-      "js/**",
-      "!js/register.js",
-      "stylesheets/*.css",
-      "audio/**",
-      "images/**",
-      "fonts/*"
+      "**/*",
+      "!**/node_modules/*/{CHANGELOG.md,README.md,README,readme.md,readme,test,__tests__,tests,powered-test,example,examples,*.d.ts}",
+      "!**/node_modules/.bin",
+      "!**/*.{o,hprof,orig,pyc,pyo,rbc}",
+      "!**/._*",
+      "!**/{.DS_Store,.git,.hg,.svn,CVS,RCS,SCCS,__pycache__,thumbs.db,.gitignore,.gitattributes,.editorconfig,.flowconfig,.yarn-metadata.json,.idea,appveyor.yml,.travis.yml,circle.yml,npm-debug.log,.nyc_output,yarn.lock,.yarn-integrity}",
+      "!test",
+      "!pack",
+      "!dist",
+      "!build",
+      "!components",
+      "!bower.json",
+      "!Gruntfile.js",
+      "!README.md",
+      "!CONTRIBUTING.md",
+      "!.sass-cache",
+      "!.tx",
+      "!.github",
+      "!.bowerrc",
+      "!.jscsrc"
     ],
     "directories": {
       "output": "pack"