Compress and download model

[Rukongai]

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Warnings

• This PR will change existing database contents.
• This PR introduces a breaking change to existing installations.

Summary

Download an entire model as a single zip file

Linked issues

#1847

Description of changes

Added a new controller for managing file downloads, a route, and button.

Needs to be refactored, cleaned up, and has bugs, but the outline is starting to appear

To Do:
Add some sort of progress or activity indicator
Delete temporary files after download
Figure out bug where larger archives don't get all the files transferred over
Fix bug where previous downloaded model is included in new download (naming + cleaning tmp will help this)
Refactor & cleanup

[Floppy]

This is cool! I was thinking about this a while back and it would be good to have the zipfile hang around in a temp folder somewhere that will get cleared out on an LRU basis, so that popular downloads don't have to be zipped up every time. Not sure exactly how that would work best though, hadn't got much further than the general idea.

[Rukongai]

i'll see what I can figure out. I'm not a programmer by trade and the first time I touched Ruby was 2 days ago, so I'm just figuring stuff out as I go along.

[Floppy]

I'm well impressed for two days of Ruby! Don't worry about that too much, it's more longer-term planning on my part. Certainly just the on-demand compression that you have here would be fine as a starter.

[codeclimate]

Method write_entries has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

[codeclimate]

Code Climate has analyzed commit b25c3d6 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

The test coverage on the diff in this pull request is 41.1% (50% is the threshold).

This pull request will bring the total coverage in the repository to 72.8% (-0.9% change).

View more on Code Climate.