Allow a custom reqwest::Client, or ClientBuilder configuration hook

[andsnpl]

I want to test redirection from my /login endpoint, but the default client created inside of new_client automatically follows redirects, so I don't get to inspect it.

[jeremychone]

This is a good one, let me work on this.

[jeremychone]

@andsnpl I just merge the two PRs, that should solve your requirement. Let me know if I can close this ticket.

• Thanks to @JamesGuthrie for
  • PR #17 + Allow building client with custom reqwest::ClientBuilder
  • PR #16 + Make rustc_http::Client public

[jeremychone]

Closing as should be fixed with the PR above merged in the previous release.