Initial commit. This was based against mediagoblin v0.4.1.
May not work against later versions of mediagoblin as it depends on functions in the standard upload form.

To deploy, put this in your mediagoblin/plugins/ directory
Then, add
[[mediagoblin.plugins.html5-multi-upload]]
to mediagoblin_local.ini

You should be able to reach the page at http://yoursite/html5-multi-upload/

It requires HTML5 support to be able to add multiple files. Files are processed one at a time (at least with my instance). This was intentional though, as I run my mediagoblin on a low power device with extremely limited CPU and RAM.