Use fetch API to enable streaming in SocketPlugin
Use fetch API to enable streaming in SocketPlugin

Use fetch API if available to download content
incrementally as suggested in #64 (with fallback
to XMLHTTPRequests). Also fix a bug when sending
bigger files.

Close #64

fniephaus/SqueakJS,bertfreudenberg/SqueakJS,sebastianconcept/SqueakJS,fniephaus/SqueakJS,Speed-Pad/online,bertfreudenberg/SqueakJS,sebastianconcept/SqueakJS,bertfreudenberg/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,bertfreudenberg/SqueakJS,Speed-Pad/online,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,sebastianconcept/SqueakJS,Speed-Pad/online,fniephaus/SqueakJS,fniephaus/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io