Change authorship of commits which are already pushed

gistfile1.txt

Fix the author of commits which are already pushed.

To fix the last six commits: 

 * First set the correct author for current Git repo using `git config --local user.name FirstName LastName`
   and `git config --local user.email first.last@example.com`
 * Then apply to the last six commits `git rebase --onto HEAD~6 --exec "git commit --amend --reset-author --no-edit" HEAD~6`
 * Finally, push using `git push --force-with-lease`