Avoid json 1.8.1 with Ruby 2.1 (debugging travis)
Avoid json 1.8.1 with Ruby 2.1 (debugging travis)

jgaskins/opal,castwide/opal,gabrielrios/opal,merongivian/opal,castwide/opal,kachick/opal,fazibear/opal,catprintlabs/opal,domgetter/opal,opal/opal,merongivian/opal,Ajedi32/opal,jgaskins/opal,Mogztter/opal,bbatsov/opal,jannishuebl/opal,kachick/opal,jannishuebl/opal,domgetter/opal,wied03/opal,c42engineering/opal,gausie/opal,jgaskins/opal,merongivian/opal,castwide/opal,gabrielrios/opal,kachick/opal,Mogztter/opal,opal/opal,Flikofbluelight747/opal,Ajedi32/opal,bbatsov/opal,suyesh/opal,catprintlabs/opal,gausie/opal,wied03/opal,catprintlabs/opal,fazibear/opal,Ajedi32/opal,gausie/opal,opal/opal,Mogztter/opal,suyesh/opal,Flikofbluelight747/opal,iliabylich/opal,iliabylich/opal,Mogztter/opal,suyesh/opal,c42engineering/opal,opal/opal,bbatsov/opal,Flikofbluelight747/opal,kachick/opal,iliabylich/opal,jannishuebl/opal,gabrielrios/opal,c42engineering/opal,fazibear/opal,wied03/opal