Rename Validators to Validator for consistency.

Signed-off-by: Tanzeel Kazi <me@tanzeelkazi.com>
Improve specPending helper.

Signed-off-by: Tanzeel Kazi <me@tanzeelkazi.com>
Add TK.Data.Validator spec.

Signed-off-by: Tanzeel Kazi <me@tanzeelkazi.com>