title: git pull request and rebase
body: <p>I have a little problem with my git.</p>
  
  <p>I fork one project on github, i change and commit some file.</p>
  
  <p>Now i want to do "Pull  request" with option rebase.</p>
  
  <p>I do a Pull Request but how can i rebase the pull request ?
  Did the original author of the repo need to accept my pull request and after i can or he can rebase, or i need to rebase after the pull request ?</p>