title: Deploy path doesn't work for Git Deploy Method in middleman-deploy
body: <p>I am using <a href="https://github.com/middleman/middleman-blog" rel="noreferrer">middleman-blog</a> and <a href="https://github.com/middleman-contrib/middleman-deploy" rel="noreferrer">middleman-deploy</a>.</p>
  
  <p>What I would like to do, is within the branch I am deploying to, I want the static files to be deployed to a subfolder within the repo (i.e. not the root folder).</p>
  
  <p>I tried doing this in my <code>config.rb</code>:</p>
  
  <pre><code>activate :deploy do |deploy|
    deploy.build_before = true
    deploy.deploy_method = :git
    deploy.branch = 'gh-pages-2'
    deploy.remote = 'github'
    deploy.path = 'blog'
  end
  </code></pre>
  
  <p>But that doesn't work, it still deploys to the root directory. In fact, it doesn't even create the <code>/blog</code> folder I am looking for.</p>
  
  <p>When I visit the config settings locally, these are the settings I see under <code>:deploy</code>:</p>
  
  <pre><code>:deploy
     :branch = "gh-pages"
     :build_before = true
     :clean = false
     :commit_message = nil
     :deploy_method = :git
     :flags = nil
     :host = nil
     :password = nil
     :path = "blog"
     :port = 22
     :remote = "github"
     :strategy = :force_push
     :user = nil
  </code></pre>
  
  <p>This indicates to me that the path attribute is being set correctly.</p>
  
  <p>I also tried doing <code>deploy.path = '/blog'</code> and that still doesn't work.</p>
  
  <p>So how can I get this to deploy to <code>\blog\</code> subfolder within my repo rather than the root directory?</p>
  
  <p>The versions of the different gems are as follows:</p>
  
  <pre><code>middleman (4.1.10)
  middleman-blog (4.0.1)
  middleman-cli (4.1.10)
  middleman-deploy (2.0.0.pre.alpha)
  </code></pre>
  
  <p><strong>Note:</strong> I am purposely using <code>gh-pages-2</code> because I don't want to overwrite my current <code>gh-pages</code> without being certain that it will deploy to the correct subfolder.</p>