Update Handlebars.js to resolve HTML entities problem

I updated Handlebars.js (`"1.0.5beta"` -> `"~1.0.11"`) to resolve HTML entities issue - https://github.com/hughsk/kss-node/issues/29.
Because the new Handlebars changed arguments of `Handlebars.registerHelper()` method, I also adjusted "bin/kss-node" for that.