title: How to make magit pull to have rebase option by default?
body: <p>I recently started using magit package in emacs and its really useful and handy. I would like to make couple of tweaks. </p>
  
  <p>How do I make magit pull to be always have rebase option?. Currently it shows up switches and I have to choose -r --rebase. In my dev process, we always rebase. </p>
  
  <p>I use gtags+global for code browsing. Upon magit pull, It would be great if I can have a hook to rebuild the gtags again. Is there hook after git pull success ?.</p>