Added DynaFields to the dynaform module
DynaFields work similar to DynaForms, in that they allow a regular
field to be created by supplying a dictionary.
The main advantage is that any property can be added, even if the
base class doesn't have support for it.
Patch by: Sverre Rabbelier
from django.dispatch import Signal
request_started = Signal()
request_finished = Signal()
got_request_exception = Signal(providing_args=["request"])