Add unit tests when blueprint paths are URLs starting with http(s)
Add unit tests when blueprint paths are URLs starting with http(s)

+ error handling too

obihann/dredd,apiaryio/dredd,NGMarmaduke/dredd,snikch/dredd,Eksmo/dredd,vladosaurus/dredd,pauladam/dredd,snikch/dredd,NGMarmaduke/dredd,pgconreaux/dredd,apiaryio/dredd,cranieri/dredd-extended,pgconreaux/dredd,Eksmo/dredd,cranieri/dredd-extended,obihann/dredd,PelegR/dredd,apiaryio/dredd,ouziel-slama/dredd,vladosaurus/dredd,sbellem/dredd,ouziel-slama/dredd,PelegR/dredd,pauladam/dredd,sbellem/dredd