Resolve "add delete datafile api endpoint"

Closes #136 (closed)

import requests
url = 'http://localhost:8000/api/v1/datafiles/json/delete/DF00000000'
headers = {'Iric-Auth-Token': '123xyz123xyz123xyz123xyz123xyz123xyz123xyz123xyz123xyz123xyz'}
r = requests.delete(url, headers=headers)
r.json()

portal/views/secure/api.py

-
 import logging
 
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.db.models import Q
 from django.shortcuts import get_object_or_404
-from django.views.generic import TemplateView, View
+from django.views.generic import TemplateView
 from django.http import JsonResponse
-# from django.views.generic.detail import SingleObjectMixin
-from django.views.generic.detail import BaseDetailView, SingleObjectMixin
+from django.views.generic.detail import BaseDetailView
 from django.utils.translation import ugettext_lazy as _
 from portal.views import TokenLoginMixin, SlugMixin
 from django.views.decorators.csrf import csrf_exempt
@@ -99,7 +97,6 @@ class DataFileDeleteJSONView(TokenLoginMixin, SlugMixin, BaseDetailView):
 
     @method_decorator(csrf_exempt, name='dispatch')
     def dispatch(self, *args, **kwargs):
-        print('dispatching')
         method = self.request.POST.get('_method', '').lower()
         if method == 'delete':
             return self.delete(*args, **kwargs)