SCORE-76. InternalFreshKijiTableReader.shouldReread() will fail if any freshness policies return fresh.

issue: https://jira.kiji.org/browse/SCORE-76
review: https://review.kiji.org/r/966
SCORE-71. FreshTool's help is superceded by a required flag exception

issue: https://jira.kiji.org/browse/SCORE-71
review: https://review.kiji.org/r/965
SCORE-77. KijiFreshnessManager does not properly release some resources.

issue: https://jira.kiji.org/browse/SCORE-77
review: https://review.kiji.org/r/972
SCORE-74. KijiFreshnessManager should not close the Kiji metatable

issue: https://jira.kiji.org/browse/SCORE-74
review: https://review.kiji.org/r/948
SCORE-75. Reimplements FreshKijiTableReader with improved concurrency

issue: https://jira.kiji.org/browse/SCORE-75
progression on InternalFreshKijiTableReaderRefactor.
completed implementation of Refactor.
Some aspects could use another pass.
not tested.