Include a copy of dictConfig in RQ, for Python 2.6 compat.
Avoid new-style classes under Python 2.6.

Little ugly fix, required because Python 2.6's logging uses old-style
classes.  Thanks for finding this one, @deferraz.
Promote to 'beta' stage.

This should've been done on 0.3.0 already, actually.
Bump version to 0.3.4.