title: Issue with Github for windows and Custom Shell
body: <p>I'm having problems trying to set my Custom Shell in Github for windows to Console2.<br>
  It seems like no matter what I try it wants to ignore my setting and just launch in powershell. </p>
  
  <p>Under Github for Windows I have the path for my custom shell set to where I have Console2 installed and the checkmark is next to Custom. (double and triple checked this for sanity)</p>
  
  <p>I've tried restarting my computer multiple times, and even changing the setting to the other options (ie cmd and Git Bash).   </p>
  
  <p>In all 3 cases launching gitshell still launches Powershell instead.<br>
  I tried to search around here and google but haven't found anyone having a similar problem. Is there anywhere (ie registry or db file) where I could check to see how these values are set, and try to override it? Or if anyone else has experiences this problem and has a solution I would greatly appreciate it!</p>