title: Getting remove_entry_secure error while using ruby application
body: <p>I am trying to split PDF files into images using docsplit. But it appears I have issues with my ruby installation. I keep getting the following error every time:</p>
  
  <pre><code>/usr/lib/ruby/1.8/fileutils.rb:694:in `remove_entry_secure': parent directory is world writable
  </code></pre>
  
  <p>Here is the full command line output:</p>
  
  <pre><code>$ docsplit images pdf-test.pdf
  /usr/lib/ruby/1.8/fileutils.rb:694:in `remove_entry_secure': parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: "/tmp/d20130207-6739-1f9i6b" (parent directory mode 42777) (ArgumentError)
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:51:in `convert'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:19:in `extract'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:19:in `each'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:19:in `extract'
      from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `each_with_index'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:18:in `each'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:18:in `each_with_index'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:18:in `extract'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:16:in `each'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit/image_extractor.rb:16:in `extract'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/lib/docsplit.rb:63:in `extract_images'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/bin/../lib/docsplit/command_line.rb:44:in `run'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/bin/../lib/docsplit/command_line.rb:37:in `initialize'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/bin/docsplit:5:in `new'
      from /var/lib/gems/1.8/gems/docsplit-0.6.4/bin/docsplit:5
      from /usr/bin/docsplit:19:in `load'
      from /usr/bin/docsplit:19
  </code></pre>
  
  <p>Any ideas on how to fix this?</p>