Remove JLine

[felixmulder]

Should it be done? We're not really depending on it anymore thanks to Ammonite.

[kzys]

Like that? I'm gonna send a PR if the direction is fine.
kzys@24c7ef7

[kzys]

On -Xnojline, doesn't it make sense to just use System.console() instead of having the flag?
http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#console%28%29

[felixmulder]

Hi @kzys - yes like that :) Would you mind making PR out of it?