Resolving strange charachters in non Mac terminal, fixes #399

Looks like the double inclusion of escaping characters (once in their definition, once in output line) was giving me trouble in Linux. Give it a try on a mac (or I will tonight).
@mathiasbynens I don't have that particular code, but in general:

> `\[` : begin a sequence of non-printing characters, which could be used to embed a terminal control sequence into the prompt
> `\]` : end a sequence of non-printing characters

(from http://ss64.com/bash/syntax-prompt.html)

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@mathiasbynens I also use Ubuntu, and they work for me. :)