Update README (#957)

README.md

@@ -26,7 +26,8 @@ The PRPL pattern, in a nutshell:
 
 ##### Prerequisites
 
-Install [polymer-cli](https://github.com/Polymer/polymer-cli):
+First, install [Polymer CLI](https://github.com/Polymer/polymer-cli) using
+[npm](https://www.npmjs.com) (we assume you have pre-installed [node.js](https://nodejs.org)).
 
     npm install -g polymer-cli
 
@@ -43,7 +44,6 @@ routing for the app:
 
     polymer serve --open
 
-
 ### Build
 
 This command performs HTML, CSS, and JS minification on the application
@@ -72,17 +72,16 @@ generated using fragment bundling:
 
 ### Run tests
 
-This command will run
-[Web Component Tester](https://github.com/Polymer/web-component-tester) against the
-browsers currently installed on your machine.
+This command will run [Web Component Tester](https://github.com/Polymer/web-component-tester)
+against the browsers currently installed on your machine:
 
     polymer test
 
 ### Adding a new view
 
 You can extend the app by adding more views that will be demand-loaded
-e.g. based on the route, or to progressively render non-critical sections
-of the application.  Each new demand-loaded fragment should be added to the
-list of `fragments` in the included `polymer.json` file.  This will ensure
-those components and their dependencies are added to the list of pre-cached
-components (and will have bundles created in the fallback `bundled` build).
+e.g. based on the route, or to progressively render non-critical sections of the
+application. Each new demand-loaded fragment should be added to the list of
+`fragments` in the included `polymer.json` file. This will ensure those
+components and their dependencies are added to the list of pre-cached components
+and will be included in the `bundled` build.