title: Reduce Heroku Compiled Slug Size
body: <p>I've just updated rails to v2.3.6 on my app under a bamboo-ree-1.8.7 stack and the compiled slug size has grown up to 40.5Mb! Previous to that last git push, the slug size was about 20Mb and was using rails v2.3.5.</p>
  
  <p>Is it because my slug has both of rails versions installed? Probably I'm missing something but I haven't added any special code/files into my app as to increase the slug size by ~20Mb.</p>
  
  <p>Can you point me on how can I reduce the slug size?</p>
  
  <p>Any help will be greatly appreciated.</p>
  
  <p>Thank you very much in advance.</p>