Contribution Checklist

• Feature improves existing core functionality
• API is compatible with existing Angular apis and relevant standards (if applicable)
• Contributor signed CLA now or in the past (after signing leave a comment here with your real name)
• PR contains unit tests
• PR contains e2e tests (if suitable)
• PR contains documentation update
• PR was tested on ci.angularjs.org for cross-browser compatibility
• PR is rebased against recent master
• PR is squashed into one commit per logical change
• PR's commit message is descriptive and allows us to autogenerate release notes (required commit message format)