add django 1.10 support

[demonno]

As patterns is removed from django.conf.urls in django 1.10 django-ajaximage raised Exceptions.

In this commit it is maintained support for previous versions of django

Did manual testing on django versions:

• 1.9
• 1.8
• 1.7

and added support for django 1.10 Example application is also modified to work for all versions.