Missing SVGs for download icon

[samjsmith]

I can't see files for download_16.svg or download_24.svg. Are they supposed to be created?

[barlock]

@samjsmith Actually no! There are not glyphs for all of the icons. download in particular only has 32, 64, and 128. You can tell for any icon by going into the source and looking at the artboards

If you can fill in the missing glyphs a pull request would be appreciated.

[seejamescode]

Thanks @mbarlock!