update url per homebrew error

When running this recipe I get the following output:

```bash
vagrant-osx-10-9:rocket-fuel-master vagrant$ /var/chef/cache/homebrew_go
Whoops, the Homebrew installer has moved! Please instead run:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Also, please ask wherever you got this link from to update it to the above.
Thanks!
```