The Git URL for cloning erros out

Current path to github gives the following error on Mac (10.8.5) with git 1.7.9.6 (Apple Git-31.1)

```
$ git clone git://github.com/angular/angular-phonecat.git
Cloning into 'angular-phonecat'...
fatal: unable to connect to github.com:
github.com[0: 192.30.252.129]: errno=Connection refused
```