Fix GitHub repo creation

Fix https://github.com/wbailey/kata/issues/6
Compatibility: GitHub API v3 http://developer.github.com/v3/

Reported-by: Jason Noble <github+jasonn@jasonnoble.org>
Signed-off-by: Lloyd Chang <lloydchang@gmail.com>
Tested-by: Lloyd Chang <lloydchang@gmail.com>