kiji-schema: SCHEMA-627. schema-table tool should permit listing all schemas and permit standard out.

issue: https://jira.kiji.org/browse/SCHEMA-627
review: https://review.kiji.org/r/1567
commit: https://github.com/kijiproject/kiji-schema/commit/1ef9b8a3b97a80788e8b8fc4232138ed92270f42