Add contributor line to .pom
Wire checkstyle plugin into maven.
Fix Checkstyle violations

Fix known Checkstyle violations.  Checkstyle currently dies on lambdas
(known issue), so the one remaining "issue" should clear up as part of
an upcoming release.
Merge remote-tracking branch 'origin/site-build-errors' into checkstyle-violations
Merge branch 'checkstyle-violations' of https://github.com/Clockwork-Muse/threeten-extra into Clockwork-Muse-checkstyle-violations
Merge branch 'Clockwork-Muse-checkstyle-violations'
Disable checkstyle until it is properly released for Java SE 8