title: an issue with the wkhtmltopdf-binary gem in the production
body: <p>I am using the gem 'wicked_pdf' to convert html to pdf.
  It is working fine in the development mode. but in the production it is throwing an error by nginx.This is the error log in the production:</p>
  
  <pre><code>I, [2017-10-17T12:34:09.726920 #17004]  INFO -- : [4a94b9f6-fdf6-4e55-b325-9b3096132d4e] Completed 500 Internal Server Error in 2638ms (ActiveRecord: 30.6ms)
  F, [2017-10-17T12:34:09.729566 #17004] FATAL -- : [4a94b9f6-fdf6-4e55-b325-9b3096132d4e]   
  F, [2017-10-17T12:34:09.729763 #17004] FATAL -- : [4a94b9f6-fdf6-4e55-b325-9b3096132d4e] RuntimeError (Failed to execute:
  ["/home/deploy/phoenix/shared/bundle/ruby/2.4.0/bin/wkhtmltopdf", "-q", "file:////tmp/wicked_pdf20171017-17004-ps7ahv.html", "/tmp/wicked_pdf_generated_file20171017-17004-17rkfch.pdf"]
  Error: PDF could not be generated!
  Command Error: /home/deploy/phoenix/shared/bundle/ruby/2.4.0/gems/wkhtmltopdf-binary-0.12.3.1/bin/wkhtmltopdf_linux_amd64: error while loading shared libraries: libXrender.so.1: cannot open shared object file: No such file or directory
  ):
  F, [2017-10-17T12:34:09.729900 #17004] FATAL -- : [4a94b9f6-fdf6-4e55-b325-9b3096132d4e]   
  F, [2017-10-17T12:34:09.730005 #17004] FATAL -- : [4a94b9f6-fdf6-4e55-b325-9b3096132d4e] app/controllers/orders_controller.rb:16:in `block (2 levels) in show'
  [4a94b9f6-fdf6-4e55-b325-9b3096132d4e] app/controllers/orders_controller.rb:13:in `show'
  </code></pre>
  
  <p>I gussed that I have an issue with missing lib: libXrender.so.1</p>
  
  <p>I am using on the production ubuntu 16.04 ruby:2.4.1 and rails 5.1.4
  Can I get your support please?</p>