What was accomplished

• Selenium-based end-to-end tests now available via gulp e2e
• Added rc-channel opt-in flag
• Submitted code to divert 0.5% AMP traffic to the RC build
• bundle-size is now a required check

What's next

• Build / serve before e2e tests
• Run e2e tests on Travis
• Make owners bot check blocking
• Remove hard bundle size check