[Hama Wiki] Trivial Update of "HamaPipes" by edwardyoon

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The "HamaPipes" page has been changed by edwardyoon:
http://wiki.apache.org/hama/HamaPipes?action=diff&rev1=4&rev2=5

Comment:
rand is defined in cstdlib

  #include <math.h>
  #include <string>
  #include <iostream>
+ #include <cstdlib>
  
  using std::string;
  using std::cout;