kiji-mapreduce: KIJIMR-290. Update dead dependency on kiji-schema 1.5.1-SNAPSHOT

issue: https://jira.kiji.org/browse/KIJIMR-290
review: https://review.kiji.org/r/1989
commit: https://github.com/kijiproject/kiji-mapreduce/commit/60b845dadbaeade71e8e9948e2bca191ac6a9525
kiji-express: EXP-464. Update dead dependency on kiji-schema 1.5.1-SNAPSHOT

issue: https://jira.kiji.org/browse/EXP-464
review: https://review.kiji.org/r/1990
commit: https://github.com/kijiproject/kiji-express/commit/95bd10b66ad6a1869fcac315045c97cd6862e100