Switch to sdk/ui/button instead of sdk/widget
using theirs
Merge branch 'feature/first-run' of github.com:mozilla/lightbeam
Update policy
Merge branch 'feature/first-run' of github.com:mozilla/lightbeam into feature/first-run
Merge pull request #517 from mozilla/feature/first-run

Feature/first run
Merge branch 'master' of github.com:mozilla/lightbeam into feature/first-run