Fix jittering when on move while effect is "solid".

[mattzeunert]

Fix for #138.

I also noticed that removing the listeners wasn't working correctly. ::this.showTooltip creates a new function that's different from this.showTooltip, so it can't be removed with .removeEventListener('mouseenter', this.showTooltip).

[wwayne]

I think the function has been correctly removed, the most easy measure to test it is put a console.log into the showTooltip function to see if it would output only once every time showing the tooltip.

This problem only happens in HD screen, retina for example, someone mentioned this before, I didn't think it's obvious under effect float so I closed the ticket, but for solid, it would be a problem, will check this later.

[mattzeunert]

Thanks. I checked with getEventListeners in Chrome and it showed lots of them.

Sorry about the build commit by the way. I started to load the forked branch locally with NPM and didn't realize doing a build on it would update the PR.

[wwayne]

Some PR to this component includes built files, so it's acceptable actually : )