* Add schema validation helper
* Add tests for cart item schema
* Fix schema errors found by tests
* Add tests and fix validation for remaining store API endpoints
* Tweak response for nested diffs
* Array syntax
* Improved nesting and type validation for schema
* Implement and fix type checking across test suite
* Type validation fixes
* Fix null comparison
* Fix array handling
* Switch to number type and support in validation
* Test the tests
* Update tests to use objects which match schema, avoiding JSON encode/decode
- adds bundlesize package and travis config to run it on pulls (reports size as a check on pulls)
- reconfigure travis configuration so that jobs are split by task for easier review/reporting
- Fix failing phpunit tests exposed as a result of the travis reconfiguration
- Fix legit fail exposed by failing phpunit test in products REST endpoint (permissions related)
- Don't abort plugin initialization when detecting no build asset file but still throw notice (necessary to ensure php tests run in travis because we don't build js/css assets unnecessarily for those tests)
Mike Jolley
Darren Ethier