Don't truncate trailing slash in configured URL.
Don't truncate trailing slash in configured URL.

Fixes blacklocus/angular-django-rest-resource#1.

pombredanne/angular-django-rest-resource,pombredanne/angular-django-rest-resource,sorenh/angular-django-rest-resource,mscienski/angular-django-rest-resource,sorenh/angular-django-rest-resource