Merge pull request #1 from grouplens/master

sync with grouplens/lenskit
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/grouplens/lenskit
Merge branch 'master' of https://github.com/grouplens/lenskit
Fix the bug in eval task so that for each algorithm instance the execution is correctly incorporated.
Merge pull request #601 from schang8000/master

Make execution info available to recommender components.