title: Could not find pg-0.17.1-x86-mingw32 in any of the sources
body: <p>I'm new to rails, and am working through a tutorial in which I've just finished pushing to app to Heroku. I was instructed to add these gems to the gemfile:</p>
  
  <pre><code>group :production do
      gem 'pg'
      gem 'rails_12factor'
  end
  
  group :development, :test do
       gem 'sqlite3'
  end
  </code></pre>
  
  <p>After that I run bundle install through Gitbash, however when I go to restart the local server I get the error: <strong>Could not find pg-0.17.1-x86-mingw32 in any of the sources</strong></p>
  
  <p>I'm running a Windows 7 32 bit machine, any ideas how I can resolve this issue?</p>