kiji-rest: REST-126. Add the clients to the package

issue: https://jira.kiji.org/browse/REST-126

Adding the clients directory to the kijiREST package.

review: https://review.kiji.org/r/1871

fixing extra space
commit: https://github.com/kijiproject/kiji-rest/commit/885a7d70f8f302f7fda3b1ce5cdaf5325511e8bd