* Gallery scaffolding
* Started RenderSliver
* demo and initial hookup
* Cleaned up demo more and scaffolding basic sliver->widget communication structure.
* works
* states and default indicator building works
* start adding docs
* added an alignment setting optimized the sliver relayout mechanism
* tested a default bottom aligned sized indicator
* Added a bunch of tests
* more fixes and more tests
* Finished the tests
* Add docs
* Add more doc diffing wrt material pull to refresh
* Mention nav bar synergy
* add more asserts
* review 1
* Fix mockito 2 / dart 2 / strong typed tests
* review
* Remove the vscode config
* review