keys should be converted to strings

[erikvold]

The following code

kibo.down([0, 5], function() {
  return false;
});

Produces the following error:

Error: string.replace is not a function
Source File: http://localhost:8500/hotspotter/libs/3rdParty/kibo.js
Line: 107

So I think that the keys input for kibo.down etc should be converted to a string, so that we are certain it is a string. Or there should be some argument validation.