kiji-modeling: EXP-279. Make the paging option for ColumnRequestInput more extensible.

issue: https://jira.kiji.org/browse/EXP-279
review: https://review.kiji.org/r/1334
commit: https://github.com/kijiproject/kiji-modeling/commit/8f04eb4937e1a94077673cb656a28806c1ecc3be