title: how to send a system message to campfire, using API?
body: <p>I've seen something like this in GitHub blog:</p>
  
  <p><img src="https://i.stack.imgur.com/tFaro.png" alt="enter image description here"></p>
  
  <p>The question is: How to send a system messaget (the one with green background)? I really want to send deploy message that way, it would really help our team chat. Or is it all userscripts? :(</p>