Group transitions

[murbanowicz]

Hi,
would be really useful to have transitions which can handle list of elements, not to create transition for every element.
E.g. having some list which is refreshed/element is added/removed we would just need to put all <div class='item'> inside <q-transition-group>

What you think?

[rstoenescu]

Basically you can work this out with Vue's <transition-group>.

<q-transition> is going to get removed at some point in the near future. Only made it because its default animation is only achievable with Velocity and not through CSS-only. So I wouldn't put too much dev time into this just to remove it later on.