Improve Support for @memberof inference with ES6 modules

[ajhyndman]

A common pattern in modern js web development is to have several named utility modules with named and default exports.

It would be ideal if documentation.js was smart enough to infer the membership status of private and exported methods that were documented inside the module.

I've set up a demonstration to illustrate what I'm after here:

https://github.com/ajhyndman/documentation-js-demo/commit/9ef86935e7682fb0d3217c534c53b1a86a49c086

[tommmyy]

anyone?