Generalise glozz-example to a dump script
Model features as a dict

Seems more Pythonic, bakes some assumptions in though.
For example, we kind of gloss over what happens if we see more than
one instance of a feature in the glozz reader.  Something would
get clobbered.

Ideally we would make the reader catch this and percolate up some
kind of warning or exception?
Update setup script for glozz-dump rename