Add OrdRec predictor
Fix All problems!
update
update
Merge pull request #477 from elehack/feature/elehack-306-eval-sharing

This works well in practice, so I am merging it. Closes #306. Also works on #478.
Document #306 in release notes
new update
Merge branch 'master' into feature/elehack-ordrec-test
Add integration tests for ordrec
Merge branch 'master' of github.com:grouplens/lenskit
Merge branch 'master' into feature/elehack-binpack