Add test avro data.
Add test avro data.

Generated with `avro-tools`

    $ avro-tools fromjson \
          --schema-file tests/data/colors.avroschema \
          tests/data/colors.json > tests/data/colors.avro

See:
http://www.michael-noll.com/blog/2013/03/17/reading-and-writing-avro-files-from-the-command-line/

googleapis/python-bigquery,googleapis/python-bigquery