Bug fixes and perf improvements for setting providers in AuthUI#591

Merged

samtstern merged 6 commits intofirebase:version-2.0.0-devfrom

SUPERCILEX:providers

Feb 24, 2017

Commits on Feb 15, 2017

Commits on Feb 16, 2017

Commits on Feb 21, 2017

Merge remote-tracking branch 'firebase/master' into providers
SUPERCILEX
committed