title: Auto Authorize SSH Auth Requests on Travis CI
body: <p>I'm doing something in my build to get this output in my travis tests. It hangs since my test cannot accept or decline, and the test fails:</p>
  
  <pre><code>The authenticity of host 'heroku.com (50.19.85.154)' can't be established.
  RSA key fingerprint is 8b:48:5e:67:0e:c9:16:47:32:f2:87:0c:1blah.
  Are you sure you want to continue connecting (yes/no)? 
  </code></pre>
  
  <p>I had a similar problem with github.com but I changed to read only urls. Instead of dealing with this problem for every x.com that hosts a git repo, is there a way to have travis just auto authorize any auth request via ssh that is made? I can do this locally via something like this: <a href="http://debuggable.com/posts/disable-strict-host-checking-for-git-clone:49896ff3-0ac0-4263-9703-1eae4834cda3">http://debuggable.com/posts/disable-strict-host-checking-for-git-clone:49896ff3-0ac0-4263-9703-1eae4834cda3</a> is it possible to set something like that up on Travis?</p>