CD to GCP and new apps.

What's Changed

• New Rotten Tomatoes app. by @preritdas in #9
• Switch singularization engine from pattern to inflect. by @preritdas in #10
• Deploy API continuously to GCP App Engine. by @preritdas in #11
• Write and add new cocktails app. by @preritdas in #12

Full Changelog: v1.1.0...v1.2.0