Add EVENT_CHUNK_UPLOADED event

[Ivan-Feofanov]

I needed to monitor the upload progress on the server side, and I added an event EVENT_CHUNK_UPLOADED with payload:

{
  file: file config from options,
  loaded: {
    bytes: bytes already loaded,
    chunks: chunks already loaded,
  },
  total: {
    bytes: file size in bytes,
    chunks: file size in chunks,
  }
}

I think it will be useful to others

[bhstahl]

Hey @Ivan-Feofanov, I fixed the issue causing travis branch builds to fail. If you want to rebase in those changes, I'd be happy to try adding this event. Thanks for your contribution!

[bhstahl]

Thanks for rebasing @Ivan-Feofanov, it looks like this build failure is something to fix.

[Lyoko-Jeremie]

i need this too.

[Acconut]

@Lyoko-Jeremie Feel free to pick up this PR and freshen it up. We are happy to merge such a PR but don't have the resources to do it on our own.

[Lyoko-Jeremie]

Hi, @Acconut , i has been tested this PR, but it not work well.
Please check the details on there : #158

[luxigo]

Hi, @Acconut , i has been tested this PR, but it not work well. Please check the details on there : #158

What's not working very well in this PR ? I cannot figure it out in your link, it seems unrelated.

At least EVENTS.EVENT_CHUNK_UPLOADED should be defined I guess

--- a/lib/constants.js
+++ b/lib/constants.js
 const EVENTS = {
     EVENT_ENDPOINT_CREATED,
     EVENT_FILE_CREATED,
+    EVENT_CHUNK_UPLOADED,
     EVENT_UPLOAD_COMPLETE,
 };

[Murderlon]

Thanks for the PR. This will be superseded by #336