SCHEMA-330. Adds default values to Node/Edge test records.
SCHEMA-330. Adds default values to Node/Edge test records.

- Allows using builders without hassle in unit-tests.

issue: https://jira.kiji.org/browse/SCHEMA-330
review: https://review.kiji.org/r/298

iafek/kiji-base,iafek/kiji-base,kijiproject/kiji-schema,kijiproject/kiji-schema,rpinzon/kiji-schema,rpinzon/kiji-schema