docs(contributing): update build and release docs

CONTRIBUTING.md

@@ -6,14 +6,26 @@ This document describes how to contribute to Batarang
 
 1. Clone the repository: `git clone git://github.com/angular/angularjs-batarang`
 2. Install the npm dependencies `npm install`
-3. Install the bower dependencies: `bower install`
+3. Build the inject script: `npm run build`
-4. Build the inject script: `npm run build`
+4. Navigate to `chrome://chrome/extensions/` and enable Developer Mode.
-5. Navigate to `chrome://chrome/extensions/` and enable Developer Mode.
+5. Choose "Load unpacked extension"
-6. Choose "Load unpacked extension"
+6. In the dialog, open the directory you just cloned.
-7. In the dialog, open the directory you just cloned.
 
 ## Running the tests
 
+## Packaging a release
+
+I (@btford) will do this periodically, but I'm adding these instructions here
+for posterity.
+
+1. Edit the version number in `manifest.json` and `package.json` with the new version.
+2. Run `gulp zip`
+3. `git add package.json manifest.json dist/`
+4. `git commit -m "v1.2.3"`
+5. `git tag v1.2.3`
+6. `git push upstream master && git push upstream --tags`
+7. Upload `batarang-v1.2.3.zip` to Web Store via the [Web Store Dashboard](https://chrome.google.com/webstore/developer/dashboard)
+
 ## Layout
 
 The `panel` directory contains...