kiji-schema: SCHEMA-874. Delete org.slf4j.LoggerFactory from kiji-schema code base

issue: https://jira.kiji.org/browse/SCHEMA-874
review: https://review.kiji.org/r/2054
commit: https://github.com/kijiproject/kiji-schema/commit/f2042a5059fd0a69bfd47fdeeb21512af846f1ba