Need to use json_pure because there's no native version of the json gem for JRuby.  #597.
Need to use json_pure because there's no native version of the json gem for JRuby.  #597.

git-svn-id: 4b387fe5ada7764508e2ca96c335714e4c1692c6@3694 0d517254-b314-0410-acde-c619094fa49f

NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror