boolean support

[timspencer]

I need to set a boolean attribute. Something like this:

knife set_attribute node mynode footest.funky true

And have it set to this:

"footest": {
  "funky": true
},

But this sets it to the "true" string, not the boolean. Is there a clever way to do it that I'm missing, or do we need to add a commandline option to make it set it as a boolean or something? Thanks, and have fun!