kiji-poms: EXP-420. Update to scala 2.10

issue: https://jira.kiji.org/browse/EXP-420
review: https://review.kiji.org/r/1704
commit: https://github.com/kijiproject/kiji-poms/commit/a7553e292519e57a07d421aa82b8a1a1880aa34f
kiji-phonebook: EXP-420. Update to scala 2.10

issue: https://jira.kiji.org/browse/EXP-420
review: https://review.kiji.org/r/1703
commit: https://github.com/kijiproject/kiji-phonebook/commit/ce666843bf94f19485117997afd2085b6ed606f1