kiji-hive-adapter: EXP-420. Update to scala 2.10

issue: https://jira.kiji.org/browse/EXP-420
review: https://review.kiji.org/r/1697
commit: https://github.com/kijiproject/kiji-hive-adapter/commit/851b80c8582117c84af0180993b7fb1b8f452c12