ES6, Linting and Code Style in Vue

[nothingismagick]

So, I've started adding the beforeDestroy hooks per #468 , but have noticed that you aren't using any enforced linting or canonical JS style. This means that there are a mixture of tabs and five spaces etc. It's hard for me to know what is canonical.

And after seeing the really awesome PR I had to #459 (review) it. And in that context I think its probably better for me NOT to work on the code at the moment and to wait for that PR to be polished and land.