Add tests for realm case sensitivity in AuthChallenge
Add tests for realm case sensitivity in AuthChallenge

As per RFC 1945 (section 11) and RFC 2617, the realm value is case sensitive.
This commit adds tests for realm case sensitivity in
Mechanize::HTTP::AuthChallenge.

sparklemotion/mechanize,flavorjones/mechanize,sparklemotion/mechanize,eligoenergy/mechanize,eligoenergy/mechanize