angular/angular.js — pull request #1834 by willthemoor (2013-01-18 21:02:43+00:00)
Title: docs(contribute) adding npm install to step-by-step

`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.

Tiny tweak for something that tripped me up.