title: How do I move master back several commits in git?
body: <p>I have a git repository which holds a Drupal site.  I spent the last day trying to build a feature using several different modules.  I have given up on my current approach and have decided to try a different combination of modules.  However, my repository has several commits on the master branch that contain this feature development process (I understand that I did not branch in an effective manner.)  I want to get rid of the last three or four commits and set master to that point in my history (I don't want to merge my current work with anything, I just want it to go away.)  How do I do this?</p>