Allow keybinding configuration

[josefnpat]

Hey, really nice tool you have here.

I run openbox w/ arch linux, and the Alt modifier is reserved for resizing and moving windows for me, so voxie never gets that input.

For anyone who encounters this same issue, I made a patch here that remaps it to the Meta modifier key.

https://gist.github.com/josefnpat/25c12b9391533fcab0fd

What would be awesome is some way to configure the keybindings!

Thanks, and have a nice day!