Remove unchecked/rawtypes/javadoc warnings.

Reviewed by: taton
SCHEMA-358. Adds a withTable(TableLayoutDesc) method to InstanceBuilder.TableBuilder.

issue: https://jira.kiji.org/browse/SCHEMA-358
review: https://review.kiji.org/r/817
Clean up release notes for release.
SCHEMA-474. Table readers are thread unsafe

- HBaseKijiTableReader instances have their own connections.
- HBaseKijiTable.openTableReader() returns the same instance.

issue: https://jira.kiji.org/browse/SCHEMA-474
review: https://review.kiji.org/r/810