json backend: added class, cover, variable output
json backend: added class, cover, variable output

ds84182/rock,fasterthanlime/rock,jonathanudd/rock,marcusnaslund/rock,thomasfanell/rock,davidhesselbom/rock,kirbyfan64/rock,kirbyfan64/rock,cogneco/rock,shamanas/rock,marcusnaslund/rock,magic-lang/rock,davidhesselbom/rock,ooc-lang/rock,zhaihj/rock,jonathanudd/rock,shamanas/rock,fredrikbryntesson/rock,ds84182/rock,cogneco/rock,magic-lang/rock,fredrikbryntesson/rock,thomasfanell/rock,ooc-lang/rock,fasterthanlime/rock,zhaihj/rock