Document history summarizer as being non-null (#363)
Document user and item DAOs as returning null (#363)
Properly handle null profiles in item scorers (#363)
Merge pull request #365 from grouplens/hotfix/2.0.2-363-scorer-npe

Fix scorer NPEs (#365)
Update Travis build on release branch (#362)

This pulls in CI support from master to the release branch.
exclude LensKit artifacts from Travis pre-download (#362)
Only pre-install Maven plugins (#362)
Backport CI profile to release branch (#362)
Fix env.CI property
improve usage when eval script is not found (#352)
Update release notes to point to GitHub
Fix 2.0.1 release note link
Add release notes for 2.0.2
Document History changes

- Add forUser to release notes
- Add @Nonnull annotations

[skip ci]