Remove an unwanted commit on git and github

gistfile1.bash

# force git/github to ignore a unwanted commit and use HEAD^ as HEAD of the repository

$ git push -f origin HEAD^:remote_branch

OR

$ git rebase -i HEAD~2
$ git push origin +master

References:

http://stackoverflow.com/questions/448919/how-can-i-remove-a-commit-on-github
Supreme git magic -----> http://www-cs-students.stanford.edu/~blynn/gitmagic/ch05.html#_8230_and_then_some