Add support for include_in_parent and include_in_root options

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #121
| License       | MIT

This adds support for `include_in_parent` and `include_in_root` in nested fields and objects.