[Hama Wiki] Update of "HowToContribute" by edwardyoon

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The "HowToContribute" page has been changed by edwardyoon:
https://wiki.apache.org/hama/HowToContribute?action=diff&rev1=21&rev2=22

  Now run the following commands:
  
  {{{
- mvn install
+ % mvn install -Phadoop1 -Dhadoop.version=1.2.0
+ or 
+ % mvn clean install -Phadoop2 -Dhadoop.version=2.0.3-alpha
+ 
  mvn eclipse:eclipse
  }}}