Fix event handling

[arjansingh]

The Problem

I was testing a component I built that uses em-flickity as a child component. When that component would destroy itself, stray events from em-flickity fire after em-flickity destroyed itself and cause test failures.

Solution

I added event cleaning logic to the component and added tests.

@dylanfoster could you please review?

[briangonzalez]

+1

[dylanfoster]

good stuff 👍