Added egmoviedyn.py playgrnd.py ; changed silly spelling typo

egmoviedyn.py - I was looking for an example of dynamically (i.e.
arbitrarily) naming attributes and tablenames in SQLAlchemy and I typed
up Lars’ Movie database example.

playgrnd.py - from the SQLAlchemy 0.9 tutorial, I write up code that
works, that takes dynamically (i.e. arbitrary) attributes and
tablenames in as classes.  For playgrnd.py, I hope to encourage others
learning or stuck on programming to have a place (i.e. piece of code,
script) to play around with stuff - use that Python real time
interpreter!