acks: Add 2 names to ACKNOWLEDGEMENTS file.

Author: dpgeorge

ACKNOWLEDGEMENTS

@@ -419,6 +419,7 @@ today. The names appear in order of pledging.
  868 Stephan Schulte, Germany
  869 Kenneth Henderick
  872 DaveP (www.davepeake.com)
+ 873 Markus Schuss, Austria
  876 Kyle Gordon, http://lodge.glasgownet.com
  877 Joseph Gerard Campbell
  881 Thanks for the board. Good luck to you. --Jason Doege
@@ -479,6 +480,7 @@ today. The names appear in order of pledging.
  1007 Charles V Bock - Charles at CharlesBock dot com
  1010 Remember June 4th, 1989
  1012 Stuart Marsden
+ 1013 Herbert Graef, Stuttgart
  1014 Arthur P, USA
  1015 John Hall & Jeremy Armijo
  1017 Luciano Ramalho, Python.pro.br