Bump version to 3.0.0 & update metadata.

Bump manifest version to 2.2

Bump manifest version to 2.1

Move the quick-add to a floating action button (FAB) per Material Des…

…ign guidelines

Fixes #175 (Broken Hangouts link)

Bump manifest to 1.5.2.

Increment manifest to v1.5.1

Add tracking event when OAuth interactive is successful

Else we only see failures, with no comparison to successes.