kiji-mapreduce-lib: KIJIMRLIB-27. Remove unused kiji-platforms dependency

issue: https://jira.kiji.org/browse/KIJIMRLIB-27
review: https://review.kiji.org/r/1787
commit: https://github.com/kijiproject/kiji-mapreduce-lib/commit/48992c38da177ee2338d4931b3c15d894fabb351
kiji-hive-adapter: KIJIHIVE-46. Update to reflect hbase class moves in KijiSchema

issue: https://jira.kiji.org/browse/KIJIHIVE-46
review: https://review.kiji.org/r/1788
commit: https://github.com/kijiproject/kiji-hive-adapter/commit/70b8152fd07d2e1d3743fcbc989836ec284f2dd3