remove superfluous encoding detection, which errors with ruby-1.9

lib/vcard/vcard.rb

@@ -665,23 +665,6 @@ def Vcard.decode(card)
         raise ArgumentError, "Vcard.decode cannot be called with a #{card.type}"
       end
 
-      case string
-        when /^\xEF\xBB\xBF/
-          string = string.sub("\xEF\xBB\xBF", '')
-        when /^\xFE\xFF/
-          arr = string.unpack('n*')
-          arr.shift
-          string = arr.pack('U*')
-        when /^\xFF\xFE/
-          arr = string.unpack('v*')
-          arr.shift
-          string = arr.pack('U*')
-        when /^\x00B/i
-          string = string.unpack('n*').pack('U*')
-        when /^B\x00/i
-          string = string.unpack('v*').pack('U*')
-      end
-
       string.force_encoding(Encoding::UTF_8)
       entities = Vpim.expand(Vpim.decode(string))