kiji-rest: REST-133. Make Kiji/KijiTable connection expiration configurable

issue: https://jira.kiji.org/browse/REST-133
review: https://review.kiji.org/r/1931
commit: https://github.com/kijiproject/kiji-rest/commit/ff498e86d8290fca15a69acd4f398000194d15bc
kiji-rest: Merge branch 'REST-133'

commit: https://github.com/kijiproject/kiji-rest/commit/36fa58999eacd0ccce8c52d15d11b54aa9339237