title: git clone with putty fails
body: <p>I'm trying to clone a git repository from bitbucket using ssh. It works nicely with https, but I keep getting the following result</p>
  
  <pre><code>&gt; git clone git@bitbucket.org:PATH/TO/MY/REPOSITORY.git
  The server's host key is not cached in the registry. You
  have no guarantee that the server is the computer you
  think it is.
  The server's rsa2 key fingerprint is:
  ssh-rsa 2048 97:8c:1b:f2:6f:14:6b:5c:3b:ec:aa:46:46:74:7c:40
  Connection abandoned.
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  </code></pre>
  
  <p>I have pageant running with the right key and GIT_SSH=C:\Program Files (x86)\Putty\plink.exe</p>