SCHEMA-989. Add dependency on kiji-commons

issue: https://jira.kiji.org/browse/SCHEMA-989
review: https://review.kiji.org/r/2282
SCHEMA-988. Add support for Cassandra internal authentication

issue: https://jira.kiji.org/browse/SCHEMA-988
review: https://review.kiji.org/r/2286
POM-54. [BREAKING CHANGE] Kiji targets Java JRE 7

issue: https://jira.kiji.org/browse/POM-54
review: https://review.kiji.org/r/2301
over-the-shoulder-reviewers: ajprax
SCHEMA-990. Add timestamp and versions predicates to Cassandra RowFilters

issue: https://jira.kiji.org/browse/SCHEMA-990
review: https://review.kiji.org/r/2285
SCHEMA-984. kiji-schema-cassandra should use cached prepared statements

issue: https://jira.kiji.org/browse/SCHEMA-984
review: https://review.kiji.org/r/2306
Add entity ID scans to cache