q-io/http should emit progress events

[dcolens]

When starting a http transfer if size is available, it would be nice that it emits progress events, if size is not available it could still emit a 100% event ?

Not really sure what is the best way to tackle this because it would only work if size is known but it would be very handy.

PS: on a side-note, it would also be nice to add https://groups.google.com/forum/#!forum/q-continuum to q-io's doc.

[kriskowal]

Both good ideas.

[kriskowal]

Q v2 supports time to completion estimates, which compose better than progress notifications. I will have to integrate that with Q-IO HTTP requests, and file read requests.

[kriskowal]

Landed progress on reader.read() for HTTP responses and requests in v2.

[kriskowal]

See #98 for continued development for making progress observable on file streams.