This PR introduces `etcher-image-stream`:
https://github.com/resin-io-modules/etcher-image-stream
a module that will handle support for decompression, URL streaming, and
any other way to get a source of data to write in Etcher.
Most of the changes in this PR are because XZ decompression includes a
native dependency (no pure JS implementations out there for now), so we
had to tweak various things for the dependency to work correctly on
Etcher/Electron.
See: https://github.com/resin-io/etcher/issues/325
Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>
