add utf-16 to utf-8 conversion functions to vwdll api for use from c# .net
  the existing functions were modified and a new FcnA form added that
  retains the current ansi/utf8 access
Add Utf16 to Utf8 conversion in marshalling from C#
Add missing eof line ending
Merge pull request #95 from nicknussbaum/master

Do utf-16 to utf-8 conversion on marshalling from C# to VW