Filling out initial rubocop support for metadata.rb and the Gemfile.

Removing tailor, cleaning up metadata and Gemfile and adding TESTING.md

Addresses: blueprint rubocop-for-ops-database
Change-Id: Ia2e02864b3c157b44cf0cf483801c6bb19f83054
Merge "Filling out initial rubocop support for metadata.rb and the Gemfile."