* lib/rubygems/dependency_installer.rb:  Pick latest prerelease gem to
  install.  Fixes RubyGems bug #468.
* test/rubygems/test_gem_dependency_installer.rb:  Test for the above.

* lib/rubygems/dependency_installer.rb:  Don't display "Done installing
  documentation" if documentation will not be installed.
* lib/rubygems/rdoc.rb:  ditto

* lib/rubygems/dependency_list.rb:  Use Array#concat for Ruby 1.x
  performance.

* lib/rubygems/installer.rb:  Use formatted program name when comparing
  executables.  RubyGems pull request #471
* test/rubygems/test_gem_installer.rb:  Test for the above.

* lib/rubygems/package.rb:  Use more explicit feature check to work
  around JRuby bug #552

* lib/rubygems/ssl_certs/GeoTrust_Global_CA.pem:  Added GeoTrust root
  certificate.

* test/rubygems/test_gem_source_list.rb:  Use "example" instead of real
  hostname


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39533 b2dd03c8-39d4-4d8f-98ff-823fe69b080e