ApplicationManifest YAML serialization fixes

[fitzoh]

fixes #881

[cfdreddbot]

Hey Fitzoh!

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[fitzoh]

CLA signed, closing and reopening

[cfdreddbot]

Hey Fitzoh!

Thanks for submitting this pull request!

All pull request submitters and commit authors must have a Contributor License Agreement (CLA) on-file with us. Please sign the appropriate CLA (individual or corporate).

When sending signed CLA please provide your github username in case of individual CLA or the list of github usernames that can make pull requests on behalf of your organization.

If you are confident that you're covered under a Corporate CLA, please make sure you've publicized your membership in the appropriate Github Org, per these instructions.

Once you've publicized your membership, one of the owners of this repository can close and reopen this pull request, and dreddbot will take another look.