title: Incrementing letters using .next
body: <pre><code>def home
    letter = 'A'
    @markers = Location.all.to_gmaps4rails do |loc, marker|
      marker.infowindow render_to_string(partial: '/locations/info', 
                                         locals: {object: loc})
      marker.picture({picture: "http://chart.apis.google.com/chart?chst=d_map_pin_letter&amp;chld=#{letter.next!}|9966FF|000000",
                      width: 32,
                      height: 32,
                      shadow_picture: "http://chart.apis.google.com/chart?chst=d_map_pin_shadow",
                      shadow_width: 110,
                      shadow_height: 110,
                      shadow_anchor: [17,36]})
      marker.title "Title - #{loc.name}"
      marker.sidebar render_to_string(partial: '/locations/sidebar', 
                                      locals: {object: loc})
      marker.json({id: loc.id})
    end
  end
  </code></pre>
  
  <p>Cool stuff.  So this works.  It cycles through the <code>do loop</code> and increments the letter.  Problem is, it starts at B.  I tried using just <code>letter</code> in the picture, then at the end using <code>letter.next!</code>, and even <code>letter = letter.next</code>, but gmaps throws an error at me.</p>
  
  <p>Is there a way to assign something besides 'A' to <code>letter</code>?</p>