Add option to keep `$ref`s (don't dereference `$ref`s)

[outdooracorn]

Thanks for creating this tool, it looks really useful.

It would be great to have an option that doesn't dereference $refs. There are some references, like ones that point to schemas in #/components/schemas, that I would like to keep in the single bundled/processed file.

The $refs should still be updated when multiple files are merged/bundled into one though.
E.g. "$ref": "../../global/schemas.json#/ExampleSchema" should become "$ref": "#/components/schemas/ExampleSchema".

[dolmen]

This is already supported from day 0. However, there is a design constraint (mentioned in README) for your included document: the $ref must use an absolute JSON pointer (the part after # must start with /) and the referenced resources must be put in a place that follows the standard Open API layout for storing components.

So for a concrete answer to this question, you have to restructure the file schemas.json to put ExampleSchema under /components/schemas instead of at root. Then your $ref will point to ../../global/schemas.json#/components/schemas/ExampleSchema