Adds instructions to delete remote branch

Syntax to delete remote branch is not the same as a local one.

Introduces the syntax mentioned in the book and
throws in the easier to remember one to boot.

Requested by, fixes #43

References:

- http://git-scm.com/book/en/Git-Branching-Remote-Branches
- http://stackoverflow.com/questions/2003505/delete-remote-branch
Removes superfluous words in remote branch delete tips
Includes quick aside on what a refspec is
Merge pull request #55 from randomecho/issue-43-delete-remote-branch

Adds instructions to delete remote branch
Update zh/remotes/index.html

文中有个“可以”重复了
Merge pull request #56 from zhanghanyun/patch-1

Update zh/remotes/index.html
Remove pronoun I from voice for lack of lone addressor

There is no single author listed, the credits are to the
GitHub team, so match up narration to fit that angle.

Pulls it back from single author perspective driving it that
may have existed long ago.
Merge pull request #57 from randomecho/pronoun-wash

Remove pronoun I from voice for lack of lone addressor
Drop pronoun I in README; Adds Contributing prompt
Merge pull request #58 from randomecho/readme-tenderly

Drop pronoun I in README; Adds Contributing prompt
add git branch -v explanation
Add git remote rename
Fix typo and move 'git remote rename' location
change location of 'git branch -v'
Merge pull request #59 from robertd/gh-pages

Add 'git branch -v' and 'git remote rename' explanations
fix the position of 'git branch -v'
Merge pull request #60 from robertd/gh-pages

fix position of 'git branch -v'