kiji-scoring: SCORE-121. FreshKijiTableReader.Builder should expose getters or isSet booleans for the various parameters

issue: https://jira.kiji.org/browse/SCORE-121
review: https://review.kiji.org/r/1229
commit: https://github.com/kijiproject/kiji-scoring/commit/891d9344376b464d835a181decb1396f04f49b21