title: "heroku run rake db:migrate" issue
body: <p>Folks, I am following Ruby on Rails Tutorial and working on the DemoApp in Chapter 2. My env is :</p>
  
  <pre><code>Win 7
  Ruby 1.9.3
  Rails 4.0.2
  </code></pre>
  
  <p>I have deployed the demo app (under directory demo_app) locally and have tested it out locally as well. I did push it to Heroku using</p>
  
  <pre><code>c:\rails_projects\demo_app heroku create --stack cedar
  c:\rails_projects\demo_app git push heroku master
  </code></pre>
  
  <p>the app gets deployed to heroku.</p>
  
  <p>When I run: <code>heroku run rake db:migrate</code>
  I get the error: </p>
  
  <pre><code>No app specified. Run this command from an app folder or specify which app to use with --app APP.
  </code></pre>
  
  <p>I have run it with <code>heroku run rake db:migrate --app demo_app</code>
  but get the same error.
  Not sure what to do.</p>