Checkout github pull requests locallly

CheckoutGithubPullRequest

Locate the section for your github remote in the `.git/config` file. It looks like this:

```
[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = gitgitgitgit.git
```

Now add the line `fetch = +refs/pull/*/head:refs/remotes/origin/pr/*` to this section. 
Kindly change the github url to match your project's URL. It ends up looking like this:

```
[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = gitgitgitgit.git
	fetch = +refs/pull/*/head:refs/remotes/origin/pr/*
```

Now fetch all the pull requests:

```
$ git fetch origin
From github.com:gitgitgit/node
 * [new ref]         refs/pull/123/head -> origin/pr/123
 * [new ref]         refs/pull/133/head -> origin/pr/133
 * [new ref]         refs/pull/144/head -> origin/pr/144
 * [new ref]         refs/pull/155/head -> origin/pr/155
...
```

To check out a particular pull request:

```
$ git checkout pr/666
Branch pr/666 set up to track remote branch pr/666 from origin.
Switched to a new branch 'pr/666'
```