add ability to forward- or reverse-delete subwords

[mhintz]

One feature I really miss from the sublime text implementation of subword navigation is the ability to delete subwords using delete/backspace instead of the direction keys. Perhaps this is not feasible here due to keyword conflicts, but it would be excellent. As I learn more about Atom, I'll look into how difficult it would be to implement this feature myself. Thanks for making an awesome package!!

[ajile]

Thanks for your response I will add this feature this when there will be time.