New locaiton for Homebrew install

I got a message from the Homebrew installer, thought I'd submit a pull request to update that. The terminal message:

    homeslice:~ ax$ ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go/install)"
    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!