Patch for Django<1.5

In Django 1.5 django.views.generic.base.View.dispatch handles only
dispatching request to right methods, so for all request methods to be
handled by one custom view method one can return this method call in
dispatch method of custom view.

In Django < 1.5 django.views.generic.base.View.dispatch does also other
things so it's better for custom view dispatch to return dispatch of
superclass. If all request methods are supposed to be handled by one
custom view method, view methods for all request methods must be present
and returning call to the one preferred view method.