Update root pom version to 1.2.1-S
SCHEMA-932. kiji-platforms should include a cdh5.0.3 platform

issue: https://jira.kiji.org/browse/SCHEMA-932
review: https://review.kiji.org/r/2151
SCHEMA-940. kiji-platforms for cdh5.0.3 needs correct version of haoop-core artifact

issue: https://jira.kiji.org/browse/SCHEMA-940
review: https://review.kiji.org/r/2167
SCHEMA-934. add cdh5.0.3 test platform to kiji-platforms

issue: https://jira.kiji.org/browse/SCHEMA-934
review: https://review.kiji.org/r/2153