support MS950 encoding

close #1406

Author: tonytonyjan

lib/mail/version_specific/ruby_1_9.rb

@@ -236,6 +236,10 @@ def Ruby19.pick_encoding(charset)
       when 'latin2'
         Encoding::ISO_8859_2
 
+      # Microsoft-specific alias for CP950 (Traditional Chinese)
+      when 'ms950'
+        Encoding::CP950
+
       else
         charset
       end

spec/mail/encoding_spec.rb

@@ -207,6 +207,7 @@
         "latin2" => Encoding::ISO_8859_2,
         "ISO_8859-1" => Encoding::ISO_8859_1,
         "cp-850" => Encoding::CP850,
+        "MS950" => Encoding::CP950,
         "" => Encoding::BINARY
       }.each do |from, to|
         it "should support #{from}" do