pyramid finished_callbacks change

view.py

from pyramid.view import view_config

def sample_callback(request):
    pass

@view_config(route_name='home', renderer='templates/mytemplate.pt')
def my_view(request):
    """
        1.6/master
        BEFORE: request.finished_callbacks  None
        AFTER: request.finished_callbacks  deque([<function sample_callback at 0x103c1ec08>])

        1.5.4 & previous
        BEFORE: request.finished_callbacks  ()
        AFTER: request.finished_callbacks  [<function sample_callback at 0x103d18a28>]
    """
    print "BEFORE: request.finished_callbacks ", request.finished_callbacks
    request.add_finished_callback(sample_callback)
    print "AFTER: request.finished_callbacks ", request.finished_callbacks
    return {'project': 'MyProject'}