[git] Move git repository

$ git remote add <newreponame> <new_repository_URL>
$ git push <newreponame> master
$ git remote rm origin
$ vi .git/config (rename newreponame to origin).

That's all.

References
[1] http://stackoverflow.com/questions/1484648/how-to-migrate-git-repository-from-one-server-to-a-new-one