This PR adds test cases for the `allowSpecialUseDomain` option introduced in [PR salesforce#173](salesforce#173).  The special use domain check was changed to be a refinement on the public suffix check since both setting and retrieving cookies can fail since not all special use domains are considered public suffixes.

The following cases are tested:
* when the cookie jar is configured with `allowSpecialUseDomain=true`, the code will skip the lookup of a public suffix when a special use domain is detected
* when the cookie jar is configured with `allowSpecialUseDomain=false`, the code will raise an error describing proper usage when a special use domain is detected