* Start on v-modal, fix layering in v-dialog
* Add shadow to v-dialog content
* Add optional group identifier to groupable compositions
This allows groupable parents to be nested more flexibly:
tabs group
item group
item
tab
In the case above, we only want the tab to trigger for tabs group, not item group.
* Add active prop support to v-list-item
Allows us to manually indicate that a list item is active, useful in v-menu
* Use v-list in vertical tabs
* Finish v-modal
* Update readme for groupable composition