Download files with nginx

@antgonza helped with this one.  Remaining to be done:

~~Get nginx into Travis CI~~ (EDIT: We are deferring this for now, since we don't know what to do at this time)
- [x] Add download links in the GUI where appropriate
- [x] Fix whatever tests are about to fail when I submit this PR
I _thought_ that closure was a requirement but could be wrong

On Wed, Nov 19, 2014 at 4:21 PM, adamrp <notifications@github.com> wrote:

> In qiita_db/meta_util.py:
>
> > +    that the user has access to, as well as all the mapping files and biom
> > +    tables associated with the analyses that the user has access to.
> > +
> > +    Returns
> > +    -------
> > +    set
> > +        A set of filepath ids
> > +    """
> > +    user = User(user_id)
> > +
> > +    # First, the studies
> > +    # There are public, private, and shared studies
> > +    study_ids = Study.get_public() + user.private_studies + \
> > +        user.shared_studies
> > +
> > +    def _get_study_fpids(constructor, object_id):
>
> All functions are first-class in python, I think! [image: :smile:] I'll
> make it top-level though
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/biocore/qiita/pull/640/files#r20616377>.
>