Allow reference/definition strings as handler functions in JavaScript

[nbubna]

This would provide parity with how ... works. It would be a fairly handy shorthand for Event translation, as well as the potentially nifty feature of late resolution of handler functions (which essentially require off/on-again to change at the moment).

It would look like:

Eventi.on('keyup[ctrl-s]', 'service:save');// event translation
Eventi.on('validate', 'App.validate');// function resolution