Build owner, html_url and url of the fake repository from its resolved name

[Thayorns]

Fbe::FakeOctokit#repository takes a name or a numeric id, and resolves the id to a full_name. It then built owner, html_url and url from the raw argument, not the resolved name. So repository(1439) claimed full_name: "zerocracy/baza" and owner.login: "1439" in the same hash, with html_url pointing at https://github.com/1439. Separately, url used the HTML host, while GitHub answers with https://api.github.com/repos/<full_name>.

All three now come from the resolved repo, as the issue suggests.

The new tests check, for the id form, that the owner is the one in full_name and that html_url and url are built from full_name. For the name form, a non-ASCII name gets an API url and keeps its owner.

Closes #693

[Thayorns]

@yegor256 take a look please, happy to clarify anything about the change.