Added rubyforge project reference to gemspec

sashimi.gemspec

@@ -8,6 +8,7 @@ Gem::Specification.new do |s|
   s.homepage           = "http://lucaguidi.com/pages/sashimi"
   s.description        = "Sashimi is a local repository for Rails plugins."
   s.has_rdoc           = true
+  s.rubyforge_project  = %q{sashimi}
   s.executables        = [ 'sashimi' ]
   s.files              = ["CHANGELOG", "MIT-LICENSE", "Rakefile", "README", "sashimi.gemspec", "setup.rb", "bin/sashimi", "lib/sashimi/commands.rb", "lib/sashimi/plugin.rb", "lib/sashimi/repositories/abstract_repository.rb", "lib/sashimi/repositories/git_repository.rb", "lib/sashimi/repositories/svn_repository.rb", "lib/sashimi/repositories.rb", "lib/sashimi.rb", "test/test_helper.rb", "test/unit/plugin_test.rb", "test/unit/repositories/abstract_repository_test.rb", "test/unit/repositories/git_repository_test.rb", "test/unit/repositories/svn_repository_test.rb"]
   s.test_files         = ["test/unit/plugin_test.rb", "test/unit/repositories/abstract_repository_test.rb", "test/unit/repositories/git_repository_test.rb", "test/unit/repositories/svn_repository_test.rb"]