kiji-express: EXP-340. Adds start, end rowkey and row filters to KijiInput.

issue: https://jira.kiji.org/browse/EXP-340
review: https://review.kiji.org/r/1554
commit: https://github.com/kijiproject/kiji-express/commit/6e5507152cc85499ab0d813ccaa7395eddfc7155