Document `fetch` usage with Browserify — and switch suggested Promise library...

Document `fetch` usage with Browserify — and switch suggested Promise library to one with a CommoJS API more similar to Fetch.

README.md

@@ -15,7 +15,7 @@ $ bower install fetch
 You'll also need a Promise polyfill for older browsers.
 
 ```sh
-$ bower install es6-promise
+$ bower install native-promise-only
 ```
 
 This can be also be installed with `npm`.
@@ -24,6 +24,35 @@ This can be also be installed with `npm`.
 $ npm install github/fetch --save
 ```
 
+### Using Fetch with Browserify and npm
+
+```js
+require('native-promise-only');
+require('fetch');
+```
+
+Note: if you install **fetch** with npm you won't be able to specify a fuzzy
+version or range of versions for **fetch** in your `package.json` as npm does
+not support installing fuzzy versions from modules not published on their
+registry.
+
+Instead, you can choose ot install **fetch** at an exact specific version by
+changing `package.json` to:
+
+```json
+...
+    "fetch": "https://github.com/github/fetch/archive/v0.1.0.tar.gz
+...
+```
+
+Alternatively, if you would prefer to install **fetch** at a fuzzy version
+you can install it via bower to install it and use the [debowerify transform](https://github.com/eugeneware/debowerify).
+
+Full worked examples of these two approaches to using **fetch** in Browserify are avalable:
+
+- [Fetch API + Browserify](https://github.com/matthew-andrews/fetch-browserify-demo)
+- [Fetch API + Browserify + Bower](https://github.com/matthew-andrews/fetch-browserify-bower-demo)
+
 ## Usage
 
 The `fetch` function supports any HTTP method. We'll focus on GET and POST