Allow toggling raw output

[gvol]

This fixes #32.

I'm not sure about the keybinding, but it seemed reasonable to me since it toggle regex mode in isearch. Let me know if you'd like me to change it and/or update the version.

[ljos]

I changed the command to something that follows this: https://www.gnu.org/software/emacs/manual/html_node/elisp/Key-Binding-Conventions.html