Further tidying the DNS class to use an array rather than a string to
compare stuff.
Removed ruby1.8isms
Fixed DNS reverse lookups to use getnameinfo
Renamed ldap test so it gets included in the test suite

--HG--
rename : t/test-ldap-probe.t => t/test-ldap-probe.rb
Tidied up test suite include path
Use getnameinfo rather than getaddrinfo
Moved test-dns-types so that it gets included in the test suite.
Added test for run_test.

--HG--
rename : t/test-dns-types => t/test-dns-types.rb
Updated changelog