* Merge branch 'vnext' of https://github.com/mozilla/send into android-preferences
Fix conflicts
* Implement wss preference url in html; Update to work with the tip of vnext branch; allow viewing the android ui from the webpack server
* Use a try/catch in case localStorage isn't available, which it isn't in a ServiceWorker
* Fix #877 Implement Start page (Empty State) Design
* Update some kotlin and android sdk things, and update to the latest code in vnext
* Begin implementing the card ui which shows after uploading.
* Implement a progress bar.
