Add build command for Chromium/Chrome.

Author: Treora

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 extension/*.js
+dist
+chrome-extension-key.pem

package.json

@@ -10,12 +10,14 @@
     "build-background-script": "browserify -o extension/background_script.js src/background_script.js",
     "watch-background-script": "watchify -o extension/background_script.js src/background_script.js -v",
     "fx-build": "web-ext build -s extension -a dist && rename -f 's/\\.zip$/.xpi/' dist/*.zip",
-    "fx-run": "web-ext run -s extension"
+    "fx-run": "web-ext run -s extension",
+    "cr-build": "crx pack extension -o dist/precise-links.crx -p chrome-extension-key.pem"
   },
   "devDependencies": {
     "babel-preset-es2015": "^6.24.1",
     "babelify": "^7.3.0",
     "browserify": "^14.3.0",
+    "crx": "^3.2.1",
     "watchify": "^3.9.0",
     "web-ext": "^1.9.1"
   },