spec/cli/server_spec.rb: Got them all to pass by adding File.expand_path in the right places.  In Windows, File.expand_path adds a drive letter to paths that start with a slash, and that was causing these specs to fail.  server_spec.rb now passes under JRuby 1.7.4 in Windows.
spec/cli/server_spec.rb: Get rid of a redundant call to new_cli.