Removed unnecessary \ (Fix ZSH prompt)

Do we need those \\?
Actually my zsh looks like this when I use them: (Notice \$ on ZSH)

![screenshot from 2013-09-16 05 30 11](https://f.cloud.github.com/assets/1577944/1146460/226edc68-1e63-11e3-979d-f5c2a83a88bd.png)

And removing them seems to be causing no issues (either in bash or zsh).