attempting to use ngraph.remove-overlaps fails because of outdated dependencies

First of all: thank you for all of ngraph!

I'm currently looking into rendering a network graph and the [youtube](https://github.com/anvaka/yasiv-youtube) and [amazon](http://www.yasiv.com/amazon#/Search?q=graph%20drawing&category=Books&lang=US) (source not found) examples have come the closest to what I want to have visually. The main problem with most of the other examples I've played with was overlapping nodes.

When loading [ngraph.remove-overlaps](https://github.com/anvaka/ngraph.remove-overlaps) (which sadly is CommonJS only) and applying it [VivaGraphJS](https://github.com/anvaka/VivaGraphJS/) via `removeOverlaps(layout, {active: true})` I get `Uncaught TypeError: layout.on is not a function`, presumably because the current VivaGraph 0.8.3 is using [old versions](https://github.com/anvaka/VivaGraphJS/blob/v0.8.3/package.json#L39) (`v0.0.21` vs `v0.1.2`). Is VivaGraph intentionally using outdated dependencies?

Inspect the v0.8.3 package.json dependency versions and compare them with the versions expected by ngraph.remove-overlaps. Reproduce removeOverlaps(layout, {active: true}) with VivaGraphJS and check the reported layout.on error. Done means establishing compatible dependency behavior or documenting why the older versions are intentional.

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