docs(contribute): adding npm install to step-by-step

Will Moore · mhevery · commit 661a7287641e · 2013-01-18T21:33:58.000-08:00
npm install is listed in the dependencies section of the contribute guide but
is missing from the step-by-step. This adds it as step 4.
diff --git a/docs/content/misc/contribute.ngdoc b/docs/content/misc/contribute.ngdoc
@@ -123,7 +123,11 @@ minified AngularJS files:
 
         git remote add upstream https://github.com/angular/angular.js.git
 
-4. To build AngularJS, run:
+4. To add node.js dependencies
+
+        npm install
+
+5. To build AngularJS, run:
 
         rake package
 
