Merge pull request #3222 from jonlemmon/patch-1

Rails Docs: Add nodejs to apt-get install command

docs/rails.md

@@ -22,7 +22,7 @@ container. This is done using a file called `Dockerfile`. To begin with, the
 Dockerfile consists of:
 
     FROM ruby:2.2.0
-    RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
+    RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
     RUN mkdir /myapp
     WORKDIR /myapp
     ADD Gemfile /myapp/Gemfile