git merge github forked repository

1. >git remote add geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git
2. >git fetch geoffyoungs
3. >git merge geoffyoungs/master

本地的repository看上去是這樣的：
>git remote -v
geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git (fetch)
geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git (push)
origin http://jihao@github.com/jihao/ruby-gmail.git (fetch)
origin http://jihao@github.com/jihao/ruby-gmail.git (push)
>git branch -a
* master
remotes/geoffyoungs/gh-pages
remotes/geoffyoungs/master
remotes/origin/HEAD -> origin/master
remotes/origin/adimircolen-master
remotes/origin/gh-pages
remotes/origin/master