Add support for Django 1.4 and up

* Module django.conf.urls.defaults has been moved to django.conf.urls in
version 1.4.

Commit references issue #3.
Make URL call compatible with Django 1.5 and up

* Syntax for {% url %} tag has been changed in version 1.5.

Commit references issue #3.
Merge pull request #4 from ruslanosipov/master

Add support for Django 1.4 and up