* lib/uri/generic.rb (URI::Generic.build):
  use hostname= to detect and wrap IPv6 hosts.
  Build is accepting URI components and users may not expect
  that a host component needs to be wrapped with square brackets
  since it's not providing a URI.
  Note: initialize with arg_check => true does not wrap IPv6 hosts.
  by Joe Rafaniello <jrafanie@redhat.com>
  https://github.com/ruby/ruby/pull/765 fix GH-765

* test/uri/test_generic.rb: Add more tests

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48666 b2dd03c8-39d4-4d8f-98ff-823fe69b080e