Do not rely on readline on echoing or not the input
Do not rely on readline on echoing or not the input

* By writing the result to an external file.
* Fixes #363.
* See #364.

sgarciac/spec,eregon/rubyspec,ruby/spec,eregon/rubyspec,nobu/rubyspec,kachick/rubyspec,sgarciac/spec,kachick/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,ruby/rubyspec,nobu/rubyspec,kachick/rubyspec,ruby/rubyspec,sgarciac/spec,ruby/spec