kiji-mapreduce: KIJIMR-295. Remove CDH 4 profile for kiji-schema-cassandra.

issue: https://jira.kiji.org/browse/KIJIMR-295
review: https://review.kiji.org/r/2069
commit: https://github.com/kijiproject/kiji-mapreduce/commit/48a37db43603b19944b8f3142fce3df76184ff96