slightly better failure message for debugging an invalid json response.
slightly better failure message for debugging an invalid json response.

botandrose/eboshi_api_shootout,botandrose/eboshi_api_shootout,botandrose/eboshi_api_shootout,jkwatson/eboshi_api_shootout,botandrose/eboshi_api_shootout,botandrose/eboshi_api_shootout,jkwatson/eboshi_api_shootout,jkwatson/eboshi_api_shootout,jkwatson/eboshi_api_shootout,jkwatson/eboshi_api_shootout