add support for colemak style vi bindings
add support for colemak style vi bindings

this allows e/n in addition to j/k (same places on the keyboard on
colemak and qwerty) to be used as arrow keys when selecting a command
from the suggested fixups.

fixes #603

SimenB/thefuck,scorphus/thefuck,scorphus/thefuck,nvbn/thefuck,Clpsplug/thefuck,mlk/thefuck,nvbn/thefuck,Clpsplug/thefuck,SimenB/thefuck,mlk/thefuck