add jsoncpp lib

houxiao

2017-08-09 908d0cbd12baeef3e0e04f84d49d1d68713385c1

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<?xml version="1.0" encoding="UTF-8"?> 
<faceted-project> 
  <installed facet="java" version="1.8"/> 
  <installed facet="jst.web" version="3.0"/> 
  <installed facet="wst.jsdt.web" version="1.0"/> 
</faceted-project>