Dialog story fixes (#220)
* Make all the dialog things look pretty
Add flexBasis/Grow/Shrink to styles
Add a clear slots component. All it does it clear the context object so that nothing below it is influenced by the slots above
* remove autofocus from dialog, expectation that people put autofocus on the thing they want it on
* In popovers, remove footer and buttons
* fix lint and dialog focus tests
* fix popover tests
* not sure why this doesn't seem updated?
* remove v2 on this one, it won't run correctly on circle
