Fixes javadoc and error message in DeleteTool to match its actual flags.

Signed-off-by: Lee Sheng <lsheng@wibidata.com>
KIJI-554. Fixes BaseTool printing unreadable exceptions.

Signed-off-by: Milo <milo@wibidata.com>
Collected Kiji Schema Javadoc improvements.

Signed-off-by: Lee Sheng <lsheng@wibidata.com>