Set nodejs engine version to more than 0.10.0 
Set nodejs engine version to more than 0.10.0 

Because maxmin requires 0.10.0.
andreialecu/grunt-contrib-cssmin,gruntjs/grunt-contrib-cssmin,nqdy666/grunt-contrib-cssmin,MoLow/grunt-contrib-cssmin,fracmak/grunt-contrib-cssmin,bhamodi/grunt-contrib-cssmin