Disable Text File Preview in Nautilus in Ubuntu 14.04
Solution 1:
It's been removed from gtk+ & nautilus starting in 3.14 (15.04) so you'll find it gone in the future if you move up from 14.04 (- I find unfortunate but to each their own..
reference - https://git.gnome.org/browse/nautilus/commit/?h=gnome-3-14&id=67fdde6a9ff2dcbe3ae25fa3e259e77a4951cc46