Google API plugin

This was built specifically to support the data load script for go-content stats.

See: https://github.com/GigaOM/gigaom/issues/4590

Related pull requests: https://github.com/GigaOM/go-content-stats/pull/23 and https://github.com/GigaOM/legacy-pro/pull/3642 and https://github.com/GigaOM/gigaom/pull/4652
removed google configuration from plugin, allow dependents to config
Merge pull request #3 from zbtirrell/initial-plugin

Google API plugin