Test on django 1.11

mod 'field_list' to be a list() so that .sort method is available

Fix related objects

Assume I have an "Identity" model, and another "URL" model with metadata
and a ForeignKey to Identity.

When looking at an Identity object (/browse/app/identity/objects/42), here
is what is currently shown for the related URLs:

    Appears in "identity" in the following URLs:

which is confusing.  With this commit, it is changed to:

    Related to the following URLs, as "identity":

When looking at the detail of an object (e.g. /browse/app/model/objects/42),
the related models were incorrectly displayed.  It showed all related models
as being the model currently displayed, so it showed this:

   Appears in "XX" in the following <model>

instead of:

   Appears in "XX" in the following <related model>

and there was the same issue for the URLs leading to related objects.

Add Python 3.6 to travis

* master:
  recover missing tests module
  rename test modules to match default discover pattern

rename test modules to match default discover pattern
Fix #29

Added Python 3 compatibility
Fixes #18

Add django 1.10 compatibility

Add RequestContext to render_to_response calls

travis: Test on django 1.8 and 1.9

Needs attention: https://travis-ci.org/Alir3z4/django-databrowse/jobs/194983198

Django 1.8 and 1.9 compatbility

This addresses the issue where when a pk is not found, a 500 is thrown

Thanks for your contribution