Dialogs with slots (#169)
* dialogs and heroes oh my
* An alert dialog!
* Moar stories and fixes to Alerts
* order of imports
* Style fixes! and more stories
* Add examples
* Get rid of useless background colors
fix max-width that caused trays to look bad
* Fix lint, fix ts, example three button default, add autofocus
* more alert stories
* fix lint
* Match specs a bit better for dialogs
Respond to code review
* Fix failing tests
* Make close button actually functional by giving it autoFocus and onDismiss, add story actions for onDismiss
Add story for waning
* fix types
* missed a comma
