Default keymap shouldn't use cmd on Linux (or Windows)

[MartinBonner]

There is no cmd key on either of these platforms. This means that the first thing I had to do after installing narrow, was change the key binding for narrow:next-item and narrow:prev-item (which were the whole point of installing the package for me).

I have raised this as a separate issue, but perhaps it is a duplicate of "think about default keymap" (#49).
Feel free to close as duplicate if so.

[t9md]

Since I'm not windows user, I've just avoided to predefine default keymaps.
Even default keymap for mac is not suitable for some user I think.
To user narrow comfortably user need to get accustomed to several keyboard shortcuts, but I cannot decide which operation is essential and which is not.
I think it's dependent on how user use narrow.

If you have good default keymap suggestion, sharing it on wiki would be good start.
I will create wiki page for that.

[t9md]

https://github.com/t9md/atom-narrow/wiki/ExampleKeymap

Page was already there.
If you can, please add example keymap directly or with link to your setting whichever.