Drop specialized @UseTimestamps
Refactor recommender graph builder
Update to devel version of Grapht
Make rating snapshot DAO serialize in-line
add logging to binary rating packer
improve support for fixed satisfactions

- diagram fixed satisfactions
- carry fixed satisfactions through graph dumper
Update for new dependency type
Merge pull request #514 from elehack/feature/elehack-prepare-new-grapht

Use new Grapht.
Update to work with renamed Grapht components
bump to released Grapht
Set release to 2.1-M2
Bump to 2.1-SNAPSHOT again
cleaned up work-in-progress changes to lenskit topN recommenders for merging
Merge https://github.com/grouplens/lenskit