Tests don't work on ruby 1.9, 2.0 or 2.1

[gauteh]

With #3 applied:

[rubymail](header-match-utf-8) $ rake test
/home/gaute/.rvm/rubies/ruby-1.9.3-p392/bin/ruby -I"lib:test" -I"/home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib" "/home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb" "test/test*.rb" 
/home/gaute/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- test/testbase (LoadError)
    from /home/gaute/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/gaute/dev/ruby/sup/rubymail/test/testaddress.rb:28:in `<top (required)>'
    from /home/gaute/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/gaute/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb:10:in `block (2 levels) in <main>'
    from /home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb:9:in `each'
    from /home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb:9:in `block in <main>'
    from /home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb:4:in `select'
    from /home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb:4:in `<main>'
rake aborted!
Command failed with status (1): [ruby -I"lib:test" -I"/home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib" "/home/gaute/.rvm/gems/ruby-1.9.3-p392/gems/rake-10.1.0/lib/rake/rake_test_loader.rb" "test/test*.rb" ]
/home/gaute/.rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `eval'
/home/gaute/.rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => test
(See full trace by running task with --trace)