File upload

Adding file upload page per study. This is ready for review but note that this is not final and will need to be modified to work. Things to do are: finalize how the visualizations should work with this page, set the upload file types for each group and decide what's erasable.

Note that `resumable-uploader.js` and `resumable-uploader.js` are 3rd party libraries but `resumable-uploader.js` needed (and perhaps will need) to be modify. At this point the only changes are in the first lines of `addFile` (lines 118-124).
Thanks, was looking in the wrong util!

I think there are two different values that we are looking at: (1) where
the biom/maps/etc will live formally, and (2) where the files should be
uploaded so we can work with, which could be the same or different. Will it
be OK to left it separate as it is or want me to consolidate? I really do
not have a strong feeling either way, except that currently we can set both
separately.