Support for zip attachments from GitHub repos.

[jayarjo]

Now that GitHub restored their downloads feature (somewhat). It would have been very useful if in addition to:

"repository": {
  "type": "git",
  "url": "git://github.com/foo/bar.git"
}

bower.json could also support the following format:

"repository": {
  "type": "zip",
  "url": "https://github.com/foo/bar/releases/download/tag/bar_tag.zip"
}

Some repos (like ours for example) tend to not include binaries. We prefer to put them separately into a downloadable zip.

[rayshan]

This has been discussed before. Reason for not implementing is here: bower/bower#584 (comment)

[katowulf]

I actually don't see a reason given in the other issue or this one for not supporting github releases. Could you clarify why this would be bad or difficult?

[rayshan]

This was decided a long time ago. I personally also think it's not such a bad idea but I don't know where other owners stand. We're still considering supporting this in bower/registry#23. Please voice your support there. Closing this in favor of the other issue so we don't have a lot of overlapping issues everywhere.