title: Specify '--remote' Heroku app based on git branch
body: <p>Is it possible to to target an app version in Heroku based on the current Git branch? In the Heroku docs, its specifies how to target a a specific version of the app.</p>
  
  <pre><code># run command on 'production'    
  $ heroku run rake db:migrate --remote production
  </code></pre>
  
  <blockquote>
    <p>To make things easier, you can use your git config to specify a
    default app. For example, if you wanted “staging” do be your default
    remote, you could set it with the following command:</p>
    
    <p><code>$ git config heroku.remote staging</code></p>
  </blockquote>
  
  <p>It would make sense to have the local development branch push to the development app and the local production branch push to the production app.</p>