Release 1.0.1

The Mercurial changelog and the list of closed tickets provide more information on what has happened, including bugs that have been fixed.

This release contains bug fixes against 1.0.

Note: recommender engines serialized with LensKit 1.0 are not compatible with LensKit 1.0.1. You will need to re-build and re-serialize your engines.

• Fix broken rec. engine factory serialization (#221).