Complete conversion of download views to CBV views using django-downloadview.

This also removes dependency on the filetransfers library.

mayan/apps/common/tests/decorators.py

@@ -1,5 +1,5 @@
 def skip_file_descriptor_check(func):
-   def func_wrapper(item):
-       item._skip_file_descriptor_test = True
-       return func(item)
-   return func_wrapper
+    def func_wrapper(item):
+        item._skip_file_descriptor_test = True
+        return func(item)
+    return func_wrapper

mayan/apps/common/tests/mixins.py

@@ -66,7 +66,7 @@ class TempfileCheckMixin(object):
             msg='Orphan temporary file. The number of temporary files and/or '
             'directories at the start and at the end of the test are not the '
             'same. Orphan entries: {}'.format(
-                ','.join(final_temporary_items-self._temporary_items)
+                ','.join(final_temporary_items - self._temporary_items)
             )
         )
         super(TempfileCheckMixin, self).tearDown()

mayan/apps/common/tests/test_views.py

@@ -6,7 +6,6 @@ from django.contrib.auth.models import Group
 from django.core.urlresolvers import clear_url_caches, reverse
 from django.http import HttpResponse
 from django.template import Context, Template
-from django.test import TestCase
 
 from permissions import Permission
 from permissions.models import Role