Allow fragments to be parsed as JSON in response data

[christianidas]

Describe the bug
We have a request to an API that is returning a JSON string (not an object). We'd like to have this response parsed, but the option for fragmentsAllowed is needed in order to parse non-object JSON. This change should allow those JSON strings, numbers, booleans, etc. to be parsed in addition to objects.

To Reproduce
Steps to reproduce the behavior:

1. Make a request to an API that returns a JSON string (not an object).

Expected behavior
The JSON string should be parsed as a string.

Screenshots
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Smartphone (please complete the following information):

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Additional context
I have a fix created, and a PR open. Please merge #254 and publish a new version.