django 2.0 support

[cyberbudy]

There is an error inside fileman/views.py on django.core.urlresolvers import reverse

[bakytzhanb]

There is an error inside fileman/views.py on django.core.urlresolvers import reverse

@cyberbudy Django 2.0 removes the django.core.urlresolvers module, which was moved to django.urls in version 1.10. You should change any import to use django.urls instead. From https://stackoverflow.com/questions/43139081/importerror-no-module-named-django-core-urlresolvers

[gregplaysguitar]

Would love a PR for this if anyone is keen to help?